水泵在停泵前，若能使（）为零，将可避免水锤现象。
A.转速；
B.流量；
C.功率；
D.效率。
参考答案：B
33．The information________in the documents proved that my husband had been out of town in his car that day.
A．included
B．to include
C．include
D．include
能直接反映血浆碱储备过多或不足的指标是（）
A.AB
B.SB
C.BE
D.BB
E.PaCO2
