单项选择题
A.high pressure alarm B.fire alarm C.extinguishers D.fusible plugs
Before liquid can flow into a pump, the air in the suct...
单项选择题Before liquid can flow into a pump, the air in the suction line must be （） sufficiently to cause the liquid to flow into the suction chamber.
A.filled B.evacuated C.compressed D.charged
Generally speaking, suction heads require to be （） for ...
单项选择题Generally speaking, suction heads require to be （） for high speed or large capacities than for low speed or small capacities.
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
