单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
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
