单项选择题
The gear, screw, and vane pumps are all classified as （）.
A.variable stroke pumps
B.multistage pumps
C.positive displacement pumps
D.triple-ported pumps
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The （） discharge a nearly constant amount of liquid regardless of pressure.
A.mixed-flow pump
B.axial-flow pump
C.centrifugal pump
D.displacement pump -
单项选择题
Sediment collects in a tubular purifier （）.
A.on top cover
B.on sides of bowl
C.in drain line on the discs
D.on the discs -
单项选择题
In an oil cooler circulated by sea water, the oil is at a larger pressure the result being that any leak in the cooler will mean a loss of （）.
A.oil
B.sea water
C.refrigerant
D.fresh water
