停电检修的线路如在另一回线路的上面，而又必须在该线路不停电情况下进行放松或架设导、地线以及更换绝缘子等工作时，要有防止导、地线（）的后备保护措施。

A.脱落

B.平移

C.跳动

D.滑跑

___, I think, and the problems could be settled.

A．If you double your efforts

B．So long as you keep up your spirits

C．Making greater efforts

D．A bit more efforts