单项选择题
A.hydraulic head
B.static head
C.heat energy
D.steam
单项选择题 Every liquid has a pressure at which it will vaporize and this pressure varies with temperatureThe word “which” means ().
单项选择题 A simple pumping system consists of a suction branch, a pump and ().
单项选择题 A(n) () is a device which adds to the energy of a liquid or gas causing an increase in its pressure and a movement of the fluid.