SS4型电力机车低压试验前将主接地隔离开关置悬空位,测量牵引电路对地绝缘电阻值应不小于()。
A、0.5MQ
B、2MQ
C、3MQ
D、100MQ
参考答案:B
---I want to know ______?
---In two weeks.
A.when did he come here
B.when he comes here
C.when he will come here
D.when will he come here
我国教师要承担的责任和义务有哪些?