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问题 判断题

IEEE802.3不是VLAN的标准

答案

参考答案：对

单项选择题

当套管偏心度大于（）%时，水泥浆必然出现窜槽现象。

A.30

B.40

C.50

D.60
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问答题

请你谈一谈戊戌变法失败的原因是什么？

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                             

                                                                                                                                                             

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