单项选择题
A mixed-flow pump is a （） pump classified by the working principle.
A.self priming
B.positive displacement
C.reciprocating
D.impeller
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相关考题
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单项选择题
The （）pump is usually used as the bilge feed pump to an oily water separator.
A.turbine
B.screw
C.vane
D.ejector -
单项选择题
The （）pump is usually used as the emergency bilge pump.
A.turbine
B.screw
C.vane
D.ejector -
单项选择题
When starting a reciprocating pump, the inlet valve should be （）.
A.closed
B.opened fully
C.cracked open
D.partly open
