一台三相异步电动机，当采用Y-△减压启动时，定子每项绕组上的电压为正常运转时电压的（）
A.A
B.B
C.C
D.D
参考答案：A
It was mining hard. Unfonunately we_____umbrellas with us. [ ]
A. take
B. took .
C. didn't take
D. don't take
对设备进行精度检查，就是对设备的各项性能进行检查和测定。
