A.once each crankshaft revolution
B.twice each crankshaft revolution
C.every other crankshaft revolution
D.every fourth stroke
您可能感興趣的試卷
你可能感興趣的試題
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
An LWT anchor often has difficulty tripping in（）.
The most common type of davit found on merchant vessels today is the（）.
The purpose of a bilge well is to（）.
The C02 flooding system is actuated by a sequence of steps which are（）.
The exhaust pipe must be gas tight throughout its entire length otherwise（）.
The boat is stowed on the davit rather than on a cradle with which type of davit?（）
All electrical appliances aboard a vessel should be grounded to（）.
Cargo pump relief valves are piped to the（）.
On a ship，a door that is required to be marked KEEP CLOSED is designed to（）.
As the propeller turns，voids are formed on the trailing and leading edges of the propeller blades causing a loss of propulsive efficiency，pitting of the blades，and vibration. These voids are known as（）.