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室外楼梯建筑面积应怎样计算? 39．室外楼梯建筑面积应怎样计算?
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皮皮学刷刷变学霸
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【单选题】根据GB/T18488.1-2015驱动电机控制器中能触及的可导电部分与外壳接地点处的阻值不应该大于()
A.
0.1&Omega
B.
0.2&Omega
C.
0.3&Omega
D.
0.4&Omega
【简答题】What is the first problem facing the students leaving university? 2. How do you think they will react if they can't find a job? 3. What do you think their parents will do if they can't find a job? 4. ...
【单选题】某三相异步电动机运行于中心点接地的三相四线制交流电源上，为保证电动机的安全运行，该电动机的金属外壳应与（）。
A.
大地连接
B.
电源中线连接
C.
电动机绕组的任一端连接
D.
外界无任何连接
【多选题】鲁迅说:“本草家提起笔来,写:砒霜,大毒。字不过四字,但他却知道了这东西曾毒死过若干性命的了。”这说明()。
A.
实践是认识的来源
B.
实践是认识的基础
C.
实践出真知
D.
一切科学知识都是人们实践经验的总结
【简答题】Pair work Talk
about free-time
activities with your
partner. You can take turns asking your partner the following questions. 1. What do you usually do in your free time? 2. What’s your favorite free-t...
【单选题】What do you think of the two hotels in the town?
A.
One is better than the other.
B.
They are not the same in size.
C.
Both of them are not good.
D.
Neither of them is good.
【简答题】起动机主接柱 30 端与蓄电池负极之间的电压应该为 +B ,与起动机外壳之间的电压为 0V ,说明( )
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