风电场的设备、消防器材应在（）时候进行检查。
A、维护；
B、使用；
C、交接班；
D、巡视。
参考答案：C
Tim had one of his legs broken when he fell off a ladder and has been ____ ever since. [ ]
A. badly off
B. well off
C. worse off
D. better off
电磁波的传播有两种方式；一种是通过无线方式传播：另一种是通 【3】 传播。
