单项选择题
In general, （） is suitable for delivering small quantifies at high pressure.
A.reciprocating pump
B.gear pump
C.centrifugal pump
D.vane pump
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相关考题
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单项选择题
Under centrifugal pumps are the volute, diffuser, mixed-flow, axial flow and （） or regenerative types.
A.reciprocating
B.hydraulic
C.turbine
D.vane -
单项选择题
Domestic water pump is started automatically by （） which operates as the water level falls to a predetermined level.
A.a level controller
B.a temperature switch
C.a pressure switch
D.a floating ball -
单项选择题
In cargo crane, （） for lifting the load.
A.a hoisting motor
B.a luffing motor
C.a mooring motor
D.a slewing motor
