單項選擇題

Under centrifugal pumps are the volute, diffuser, mixed-flow, axial flow and （） or regenerative types.

A.reciprocating
B.hydraulic
C.turbine
D.vane

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單項選擇題

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

單項選擇題

In cargo crane, （） for lifting the load.

A.a hoisting motor
B.a luffing motor
C.a mooring motor
D.a slewing motor