三相异步电动机定子绕组用降压法检修时,为查出某一相接地故障,先在另一相加入低压交流电,在另外两相测感应电压,有短路那相的感应电压偏小。
A. 对
B. 错
在5t桥式起重机线路中,为了安全,除起重机要可靠接地外,还要保证起重机轨道必须接地或重复接地,接地电阻不得大于8Ω。
A. 对
B. 错
5t桥式起重机线路中,凸轮控制器的手柄处于第一挡时,所有5对触点都是断开状态,电动机处于最高速的运行状态。
A. 对
B. 错
What does the woman mean
A. She is probably to fail the exam again.
B. She doesn’’t want to pass the exam because she wants to disappoint the man.
C. She is confident that she will pass the exam.
D. She didn’’t take part in the exam.