單項(xiàng)選擇題Additional heat extraction from the exhaust gases can be effected by adding an () section to the unit in plants.

A.air cooler
B.economizer
C.injector
D.air blower


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1.單項(xiàng)選擇題Oil water separators are used to ensure that ships don’t discharge oil when () bilge water.

A.to pump off
B.being pumped
C.pumping out
D.it pumping out

2.單項(xiàng)選擇題In general, () is suitable for delivering small quantifies at high pressure.

A.reciprocating pump
B.gear pump
C.centrifugal pump
D.vane pump

3.單項(xiàng)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

4.單項(xiàng)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

5.單項(xiàng)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