集气管内部着火，打开通往集气管的蒸汽灭火。
参考答案：对
Some students think that _____ English songs helps to improve their English a lot.
A．singing
B．sang
C．sing
D．sings
潜油电泵井从控制屏上录取的资料是（）。
A.电流
B.电压
C.静压
D.流压
