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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

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