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【简答题】
某三相异步电动机的铭牌数据如下：PN=5.5kW.nN=1440r/min，UN=380V，ηN=85.5%，cosφN=0.84，Tst/TN=2.2，则该电动机的额定电流IN=（）A，Tst=（）N 2 m。
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【单选题】低压配电系统的接地形式中,TN系统和TT系统的共同点是( )。
A.
电源侧一点直接接地
B.
电源侧一点经大电阻接地
C.
受电侧设备外露可导电部分直接接地
D.
受电侧设备外露可导电部分经接地的电源中性点接地
【简答题】当结构体系的( )与简谐地面运动频率相近时结构发生强烈振动反应的现象称为共振。
【简答题】translate the following sentence to Chinese: Any differentiable function must be continuous at every point in its domain. The converse does not hold: a continuous function need not be differentiable.
【单选题】低压配电系统的接地形式中,TN系统和TT系统的共同点是( )
A.
电源侧一点直接接地
B.
受电侧设备外露可导电部分直接接地
C.
受电侧设备外露可导电部分经接地的电源中性点接地
【多选题】In terms of answering the question, what was the difference between the American professor and the Chinese participants?
A.
The professor would like to give a direct answer from a specific perspective.
B.
The professor does not like to mention personal experiences.
C.
The Chinese participants would like to mention the point at the end.
D.
The Chinese participants tend to offer as much information as possible from a holistic perspective.
【单选题】低压配电系统的接地形式中,TN系统和TT系统的共同点是
A.
电源侧一点直接接地
B.
电源侧一点经大电阻接地
C.
受电侧设备外露可导电部分直接地
D.
受电侧设备外露可导电部分经接地的电源中性点接地
【简答题】The Fate of P& G's New Shampoo Product “Ascend” in China At the end of the 1990s, the shampoo market was booming in China. With the flourishing Chinese brands, P&G was confronted with a tough time in ...
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