单项选择题
A.1/2 B.1 C.2 D.3
Which of the following pumps will most affect oily wate...
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
Which of the following pumps is most suitable for an oi...
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
With reference to a two ram actuating mechanism, which ...
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
