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單項(xiàng)選擇題

According to the principle of two stroke diesel engine, what is the number of its efficient work stroke per revolution?（）

A.1/2
B.1
C.2
D.3

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單項(xiàng)選擇題

Which of the following pumps will most affect oily water separator performance and give the worst result?（）

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

單項(xiàng)選擇題

Which of the following pumps is most suitable for an oily water separator?（）

A.reciprocating pump
B.vane pump
C.mono pump
D.axial-flow pump

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