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
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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 -
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 （）.
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单项选择题
In many installations basket strainers consist of a cylindrical container in which a perforated metal or wire basket is suspendedThe bold and italic word “which” means （）.
A.installations
B.basket strainers
C.a cylindrical container
D.a metal or wire basket
