单项选择题
A.greater B.smaller C.better D.worse
Some of the energy fed into the pump will be dissipated...
单项选择题Some of the energy fed into the pump will be dissipated as （） due to mechanical inefficiencies, the remainder will be converted into pressure rise and fluid velocity.
A.hydraulic head B.static head C.heat energy D.steam
Every liquid has a pressure at which it will vaporize a...
单项选择题Every liquid has a pressure at which it will vaporize and this pressure varies with temperatureThe word “which” means （）.
A.a liquid B.a pressure C.a temperature D.none of the above
A simple pumping system consists of a suction branch, a...
单项选择题A simple pumping system consists of a suction branch, a pump and （）.
A.a priming device B.a discharge branch C.a filter D.a suction valve
