下列选项()不属于编制有序用电方案时优先保障的用电对象。
A.水泥生产企业
B.军工企业
C.居民生活用电
D.医院与学校
参考答案:A
汽车遇情况紧急刹车,经3s停止,刹车距离为9m.若汽车刹车后做匀减速直线运动则汽车停止前最后1s的位移大小是( )
A.4m
B.3m
C.2m
D.1m
Whenever your marine radio is on,FCC Rules require you to monitor().
A.a commercial ship-to-ship channel
B.the last frequency that was used
C.the distress and calling frequency
D.the radio only if expecting a call