蓄电池机车库着火时，为防止（）爆炸，应切断电源，停止充电，加强通风，并及时地把蓄电池运出硐室。
A.瓦斯
B.氢气
C.氧气
参考答案：B
Every month he measures his baby daughter against the wall to see how much ____ she is getting.
A．tall
B．the taller
C．taller
D．tallest
空气制动阀空气位的工作位置有哪些？
