人力同向推车,巷道坡度小于千分之五时两车间距不得小于()。
A、5m
B、10m
C、15m
D、30m
参考答案:B
In my opinion, life in the twentyfirst century is much easier than . [ ]
A. that used to be
B. it is used to
C. it was used to
D. it used to be
当接触网作业车工作完毕,升降回转作业平台上、下所有开关必须置()位。
A.最小
B.中间
C.最大