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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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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

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

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