下列缩写字为指示给药次数的是()
A.bid
B.sid
C.hs
D.q6h
E.pm
参考答案:A, B, D
There were many more people who got injured in the big fire than _______.
A.was reported
B.it was reported
C.were reported
D.they were reported
已知一台离心泵的输送流量为80m3/h,扬程为50m,介质密度为891kg/m3,其轴功率N为14.9kw,该泵的效率为()。
A、68.3%
B、65.2%
C、61.8%
D、58%