单项选择题
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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相关考题
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单项选择题
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 -
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 -
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
