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。