接班司机未到时，交班司机（）。
A、可以下班出井
B、不准离开机车升井
C、可以打瞌睡
参考答案：B
On receiving a phone call from his wife ______ she had a fall, Mr. Gordon immediately rushed home from office.
A．says
B．said
C．saying
D．tosay
某采区下山单轨岩巷掘进，宜采用哪类装岩机（）。
A、铲斗后卸式装岩机
B、耙斗式装岩机
C、蟹爪装岩机
D、以上均可
