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
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相关考题
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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 -
单项选择题
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 -
单项选择题
Which of the following equipment is not pollution prevention equipment?（）
A.oily water separator
B.sewage treatment plant
C.fuel oil separator
D.incinerator
