煤气事故发生后（）应安排专人控制操作。
A、煤气隔断装置
B、压力表或蒸汽
C、氮气接头
D、煤气阀门
参考答案：A, B, C
—________ you ________ the TV play My Ugly Mother?
—Yes, it’s well worth seeing. It’s so moving that I’ve seen it twice.
A．Do, see
B．Have, seen
C．Are, seeing
D．Will, see
离心性等张运动
