当泵输送的液体()较高时,易产生气蚀因素。
A.流速
B.流量
C.温度
参考答案:C
Many a time I saw him to the shop and his watch .
A.go;have;repaired
B.going;having;repairing
C.to go;to have;repaired
D.went;had;to repair
按含水岩层空隙的性质,地下水分为()。
A、孔隙水
B、裂隙水
C、岩溶水
D、承压水