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style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">4.2</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">伺服进给系统的稳定性分析</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> <table cellpadding="0" cellspacing="0"> <tbody> <tr> <td width="16.4667" height="0"> </td> </tr> <tr> <td> </td> <td><img width="574" height="15" src="file:///E:\QQPCmgr\Temp\ksohtml\wps71.tmp.png" alt="" /></td> </tr> </tbody> </table> <p class="NewStyle45" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:0.0000pt; margin-left:0.0000pt; text-indent:26.0000pt; mso-pagination:none; text-align:justify; text-justify:inter-ideograph; "><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">滚珠丝杠伺服进给系统的稳定性是系统正常工作的前提。空心滚珠丝杠、实心滚 珠丝杠的稳定性用开环伯德图来验证，并从理论上用劳斯判据证明了从电机到工作台 </span><span class="15" style="font-family: 宋体; letter-spacing: 2pt; font-size: 10.5pt;">机械部分系统的稳定性。根据上面的分析及表4.1、表</span><span class="15" style="font-family: 宋体; letter-spacing: 2pt; font-size: 10.5pt;">4.2</span><span class="15" style="font-family: 宋体; letter-spacing: 2pt; font-size: 10.5pt;">中的参数在 </span><span class="19" style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt;">MATLAB</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">/</span><span class="19" style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt;">Simulink</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">中建立整个系统、部分系统</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">[</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt; vertical-align: super;">4</span><span class="19" style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt; vertical-align: super;">G</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">'</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt; vertical-align: super;">53</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">]</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">的仿真模型分别如图4.2、图4.3。</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> <p class="NewStyle51" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:0.0000pt; margin-left:0.0000pt; text-indent:26.0000pt; mso-pagination:none; text-align:justify; text-justify:inter-ideograph; "><span style="font-family: 宋体; font-size: 10.5pt; letter-spacing: 0pt; line-height: 22.1pt; text-indent: 0pt;">系统稳定性的判断：稳定性是指当输出量偏离给定的输入量的初始值随着时间的 推移，能逐渐趋于零时，则系统稳定。由闭环传函判断系统判别是否为最小相位系统。</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">滚珠丝杠伺服进给系统的稳定性是系统正常工作的前提。空心滚珠丝杠、实心滚 珠丝杠的稳定性用开环伯德图来验证，并从理论上用劳斯判据证明了从电机到工作台 </span><span class="16" style="font-family: 宋体; letter-spacing: 2pt; font-size: 10.5pt;">机械部分系统的稳定性。根据上面的分析及表4.1、表</span><span class="16" style="font-family: 宋体; letter-spacing: 2pt; font-size: 10.5pt;">4.2</span><span class="16" style="font-family: 宋体; letter-spacing: 2pt; font-size: 10.5pt;">中的参数在 </span><span class="22" style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt;">MATLAB</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">/</span><span class="22" style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt;">Simulink</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">中建立整个系统、部分系统</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">[</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt; vertical-align: super;">4</span><span class="22" style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt; vertical-align: super;">G</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">'</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt; vertical-align: super;">53</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">]</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">的仿真模型分别如图4.2、图4.3。</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> <p class="NewStyle51" style="margin: 0pt; text-indent: 0pt; line-height: 22.1pt;"><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> <table cellpadding="0" cellspacing="0"> <tbody> <tr> <td><span style="font-family: 宋体; font-size: 10.5pt; letter-spacing: 0pt; line-height: 11pt; text-indent: 0pt;"><br /> 然后由闭环系统传涵推导出开环传涵，用伯德图稳定判据的程序判定系统的稳定性。</span></td> <td> </td> </tr> </tbody> </table> <p class="NewStyle51" style="margin: 0pt; text-indent: 25pt; line-height: 22.1pt;"><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">通过对伯德图4.4、伯德图</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">4.5</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">对比可知实行滚珠丝杠与空心滚珠丝杠都是稳定的， 差别不明显。</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"><br clear="all" style="page-break-before:always" /> </span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> <p class="NewStyle51" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:2.4000pt; margin-left:0.0000pt; text-indent:26.0000pt; mso-pagination:none; text-align:justify; text-justify:inter-ideograph; line-height:11.5000pt; mso-line-height-rule:exactly; "><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">无论空心滚珠丝杠还是实心滚珠丝杠，在</span><span class="22" style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt;">Mat</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"> </span><span class="22" style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt;">lab</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">对话框中显示：</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> <p class="NewStyle53" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:2.4000pt; margin-left:0.0000pt; text-indent:26.0000pt; mso-pagination:none; line-height:11.5000pt; mso-line-height-rule:exactly; "><span style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt;">The</span><span class="18" style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"> </span><span style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt;">system</span><span class="18" style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"> </span><span style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt;">is</span><span class="18" style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"> </span><span style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt;">stable</span><span style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> <p class="NewStyle53" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:0.0000pt; margin-left:0.0000pt; text-indent:26.0000pt; mso-pagination:none; line-height:11.5000pt; mso-line-height-rule:exactly; "><span style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt;">The</span><span class="18" style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"> </span><span style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt;">system</span><span class="18" style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"> </span><span style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt;">is</span><span class="18" style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"> </span><span style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt;">minimal</span><span class="18" style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"> </span><span style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt;">phase</span><span style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> <p class="NewStyle51" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:0.0000pt; margin-left:0.0000pt; text-indent:26.0000pt; mso-pagination:none; text-align:justify; text-justify:inter-ideograph; "><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">由自控原理可知：由于系统存在着惯量，当系统的各个参数分配不恰当时，将会 引起系统的振荡或是越来越远离平衡位置而失去工作能力。由此可见，减小系统的惯 量对于系统的稳定性是有利的。对于线性系统来说，非最小相位系统是传递函数中至 少有一个极点或零点的实部值为正值的一类线性定常系统。反之，当系统的所有极点 和零点的实部均为负值时，称为最小相位系统。最小相位系统传递函数可由其对应的 开环对数频率特性唯一确定。</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> <p class="NewStyle51" style="margin: 0pt 0pt 31.65pt; text-indent: 26pt;"><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">由此可知系统是稳定的。下面由闭环系统的特征方程式</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">4.32</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">推导</span><span class="22" style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt;">Routh</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">判据， 由</span><span class="22" style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt;">Routh</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">判据并带入具体参数得</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> <p class="NewStyle54" style="margin: 0pt; text-indent: 0pt; line-height: 10pt;"><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">表</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">4.3 </span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">系统的</span><span class="24" style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-weight: bold; font-size: 10.5pt;">Routh</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">表</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> <table class="MsoNormalTable" style="border-collapse:collapse; width:129.1500pt; mso-table-layout-alt:fixed; mso-padding-alt:0.0000pt 5.4000pt 0.0000pt 5.4000pt ; "> <tbody> <tr style="height:25.2000pt; "> <td width="45" valign="center" style="width: 33.85pt; padding: 0pt 5.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="NewStyle51" style="margin: 0pt; text-indent: 0pt; line-height: 9.5pt;"><span class="26" style="font-family: 'Times New Roman'; letter-spacing: 0.5pt; font-size: 10.5pt;">S</span><span class="15" style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt; vertical-align: super;">3</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> </td> <td width="83" valign="center" style="width: 62.9pt; padding: 0pt 5.4pt; border-left-width: 0.5pt; border-left-style: solid; border-left-color: windowtext; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="NewStyle51" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:0.0000pt; margin-left:0.0000pt; text-indent:0.0000pt; mso-pagination:none; text-align:center; line-height:9.5000pt; mso-line-height-rule:exactly; "><span class="15" style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">0.16</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> </td> <td width="43" valign="center" style="width: 32.4pt; padding: 0pt 5.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="NewStyle51" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:0.0000pt; margin-left:0.0000pt; text-indent:0.0000pt; mso-pagination:none; text-align:right; line-height:9.5000pt; mso-line-height-rule:exactly; "><span class="15" style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">663</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> </td> </tr> <tr style="height:28.3000pt; "> <td width="45" valign="center" style="width: 33.85pt; padding: 0pt 5.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="NewStyle51" style="margin: 0pt; text-indent: 0pt; line-height: 9.5pt;"><span class="26" style="font-family: 'Times New Roman'; letter-spacing: 0.5pt; font-size: 10.5pt;">S</span><span class="15" style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt; vertical-align: super;">2</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> </td> <td width="83" valign="center" style="width: 62.9pt; padding: 0pt 5.4pt; border-left-width: 0.5pt; border-left-style: solid; border-left-color: windowtext; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="NewStyle51" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:0.0000pt; margin-left:0.0000pt; text-indent:0.0000pt; mso-pagination:none; text-align:center; line-height:9.5000pt; mso-line-height-rule:exactly; "><span class="15" style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">0.0063</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> </td> <td width="43" valign="center" style="width: 32.4pt; padding: 0pt 5.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="NewStyle51" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:0.0000pt; margin-left:0.0000pt; text-indent:0.0000pt; mso-pagination:none; text-align:right; line-height:9.5000pt; mso-line-height-rule:exactly; "><span class="15" style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">26</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> </td> </tr> <tr style="height:28.1000pt; "> <td width="45" valign="center" style="width: 33.85pt; padding: 0pt 5.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="NewStyle51" style="margin: 0pt; text-indent: 0pt; line-height: 9.5pt;"><span class="26" style="font-family: 'Times New Roman'; letter-spacing: 0.5pt; font-size: 10.5pt;">S</span><span class="15" style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt; vertical-align: super;">1</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> </td> <td width="83" valign="center" style="width: 62.9pt; padding: 0pt 5.4pt; border-left-width: 0.5pt; border-left-style: solid; border-left-color: windowtext; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="NewStyle51" style="margin-top:0.0000pt; margin-right:0.0000pt; margin-bottom:0.0000pt; margin-left:0.0000pt; text-indent:0.0000pt; mso-pagination:none; text-align:center; line-height:9.5000pt; mso-line-height-rule:exactly; "><span class="15" style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">0.0169</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> </td> <td width="43" valign="top" style="width: 32.4pt; padding: 0pt 5.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="MsoNormal"><span style="font-family: MingLiU; letter-spacing: 0pt; font-size: 10.5pt;"> </span></p> </td> </tr> <tr style="height:30.2500pt; "> <td width="45" valign="center" style="width: 33.85pt; padding: 0pt 5.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="NewStyle51" style="margin: 0pt; text-indent: 0pt; line-height: 9.5pt;"><span class="26" style="font-family: 'Times New Roman'; letter-spacing: 0.5pt; font-size: 10.5pt;">S</span><span class="15" style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt; vertical-align: super;">0</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> </td> <td width="83" valign="center" style="width: 62.9pt; padding: 0pt 5.4pt; border-left-width: 0.5pt; border-left-style: solid; border-left-color: windowtext; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="NewStyle51" style="margin: 0pt 0pt 0pt 14pt; text-indent: 0pt; line-height: 9.5pt;"><span class="15" style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">26</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p> </td> <td width="43" valign="top" style="width: 32.4pt; padding: 0pt 5.4pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="MsoNormal"><span style="font-family: MingLiU; letter-spacing: 0pt; font-size: 10.5pt;"> </span></p> </td> </tr> </tbody> </table> <p class="MsoNormal"><span style="font-family: MingLiU; letter-spacing: 0pt; font-size: 10.5pt;"> </span></p> <p class="NewStyle51" style="margin: 1.2pt 0pt 24.45pt; text-indent: 26pt; line-height: 22.1pt;"><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">从</span><span class="22" style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt;">Routh</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">表可知，前两行数值的符号为正，第一列数值的符号全部为正，故该系 统稳定。然而从</span><span class="22" style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt;">s</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">2</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">及</span><span class="22" style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt;">si</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">的数值较小可知，系统的稳定余量很小，由于主要是判断系 统的稳定性，故在建立系统的模型时没有将</span><span class="22" style="font-family: 'Times New Roman'; letter-spacing: 0pt; font-size: 10.5pt;">PID</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">控制器及伺服放大器的模型一并建立 </span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">(</span><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;">传递函数复杂）。</span></p> <p class="NewStyle51" style="margin: 1.2pt 0pt 24.45pt; text-indent: 26pt; line-height: 22.1pt;"> </p> <p class="NewStyle51" style="margin: 1.2pt 0pt 24.45pt; text-indent: 26pt; line-height: 22.1pt;"><span style="font-size:9.0pt;font-family:宋体;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman";mso-bidi-font-family: "Times New Roman";mso-font-kerning:1.0pt;mso-ansi-language:EN-US;mso-fareast-language: ZH-CN;mso-bidi-language:AR-SA">本文采摘自“空心滚珠丝杠在数控机床伺服进给系统中的应用研究”，因为编辑困难导致有些函数、表格、图片、内容无法显示，有需要者可以在网络中查找相关文章！本文由伯特利数控整理发表文章均来自网络仅供学习参考，转载请注明！</span></p> <p class="NewStyle51" style="margin: 1.2pt 0pt 24.45pt; text-indent: 26pt; line-height: 22.1pt;"><span style="font-family: 宋体; letter-spacing: 0pt; font-size: 10.5pt;"><o:p></o:p></span></p></div> <div class="blank30"></div> <!-- tag --> <div class="blank10"></div> 标签： <a 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