取源部件及敏感元件不应设臵在人孔、看火孔、防爆门及（）附近。
A、入口门
B、排污门
C、出口门
参考答案：B
.
The question then ______ that the supply of drinking water in the mountainous area is serious.
A．rises
B．arises
C．raises
D．assesses
乘务员应保证定期复训并保持熟练水平。
