煤气的一般隔断装置分为()三种。
A、闸阀
B、密封蝶阀
C、盘形阀
D、一般阀门
参考答案:A, B, C
a lift on her way , Jenny finally managed to get to the station in time.
A.offered
B.offer
C.offering
D.to offer
肾小球内流的液体是( )
A.动脉血
B.静脉血
C.原尿
D.尿