单项选择题
A.self priming B.positive displacement C.reciprocating D.impeller
The （）pump is usually used as the bilge feed pump to an...
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
The （）pump is usually used as the emergency bilge pump....
单项选择题The （）pump is usually used as the emergency bilge pump.
When starting a reciprocating pump, the inlet valve sho...
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
