比转速的物理意义是指在泵内的扬程为1m,流量为()时的转速。
A.0.05m/s;
B.0.06m/s;
C.0.075m/s;
D.0.080m/s。
参考答案:C
This school was _____ in 1950 and has a history of nearly sixty years.[ ]
A. got up
B. set up
C. sent up
D. taken up