單項選擇題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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1.單項選擇題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

2.單項選擇題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

3.單項選擇題With reference to a two ram actuating mechanism, which one of the following statement is false?（）

A.The rams work inside cylinders
B.The cylinders have glands sealing their open ends
C.The rams are connected to a cross-head
D.The cross-head is mounted on the rudder stock

4.單項選擇題The DC excitation to the field of brushless synchronous is generally produced by （）

A.an exciter driven by the same shaft with the generator
B.an exciter driven by external prime mover
C.generator itself
D.either A and B

5.單項選擇題Which of the following equipment is not pollution prevention equipment?（）

A.oily water separator
B.sewage treatment plant
C.fuel oil separator
D.incinerator