单项选择题
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
When starting a centrifugal pump, the discharge valve s...
单项选择题When starting a centrifugal pump, the discharge valve should be （）.
