区间铁塔、无线中继器、通信机柱、信号机柱等检修时，必须执行（）。
参考答案：登高作业标准
— Have you persuaded him?
— Yes.After some hours of discussion, I ________ to reason (说服) him into accepting the new plan.[ ]
A. had managed
B. would manage
C. manage
D. managed
微型电扇的内部构造如图所示．在完好的微型电扇的插头处接一只发光二极管，用手旋转叶片，将发现二极管发光，这说明 _________ ；微型电扇接入电路中能转动，其工作原理是 _________ ．
