斜井和主要轨道上下山和轨运合一巷道每隔（）都要设臵躲避硐室.
A.30m
B.40m
C.50m
参考答案：B
As the President's car appeared, the waiting crowds ______ loud cheers.
A．broke in
B．broke off
C．broke into
D．broke through
智能建筑工程机柜、机架安装垂直度偏差≤（）mm
A.2
B.3
C.4
D.5
