单线半自动闭塞区间和双线反方向出站调车时,须有停止基本闭塞法的调度命令,与临站办理闭塞手续,并发给司机()。
A.路票
B.出站调车通知书
C.调度命令
参考答案:B
The young dancers looked so beautiful in their new clothes that we took ________ pictures of them. [ ]
A. many of
B. masses of
C. the number of
D. a large amount of
GMDSS中的三种EPIRB是()米水深至少保持5分钟水密
A、5
B、9
C、10
D、12