110V直流母线在绝缘非常好的情况下,用电压表测得正极对地电压应()V.
A、110V;
B、55V;
C、0
参考答案:B
Look and fill in the blanks. 看图,填空。
Miss Li: Where do you 1. , Mary?
Mary: I live in 2. .
Miss Li: Is your house near 3. ?
Mary: No. It's 4. our school. My house is near the 5. .
室内设备、物品损坏应及时()。
A.移动
B.维修
C.更换
D.保养