A.once each crankshaft revolution
B.twice each crankshaft revolution
C.every other crankshaft revolution
D.every fourth stroke
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A.They are less expensive
B.They are smaller for equivalent pumping ability
C.They pump more cargo in less time
D.All of the above
A.cargo pump pressure gauges
B.crossover lines interconnecting two pumps
C.suction side of pumps
D.atmosphere through pump vents
A.advance
B.cavitation
C.edging
D.slip
A.a not knowing
B.an unknowing
C.an unknown
D.a not known
A.brake
B.devil's claw
C.pawls
D.All of the above
最新試題
The series of valves used to control the return flow in well control operations is called the（）.
The portable radio apparatus means（）.
The exhaust pipe must be gas tight throughout its entire length otherwise（）.
All electrical appliances aboard a vessel should be grounded to（）.
The extension of the after part of the keel in a single-screw vessel upon which the stern post rests is called the（）.
Permission is kindly requested（）the ballast water.
Anchors are prevented from running out when secured by the（）.
On a ship，a door that is required to be marked KEEP CLOSED is designed to（）.
Cargo pump relief valves are piped to the（）.
The bypass valve on a self-contained breathing device should be opened if（）.