单项选择题
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
A(n) （） is a device which adds to the energy of a liqui...
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.
A.pump B.engine C.turbine D.boiler
Lubricating oil systems are fitted with a wide variety ...
单项选择题Lubricating oil systems are fitted with a wide variety of strainers some of which can be cleaned in site while others have replaceable cartridgesThe bold and italic word “which” means （）.
A.lubricating oil B.lubricating oil systems C.strainers D.cartridges
