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
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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
A.sand
B.soft soil
C.stiff clay
D.heterogeneous soil
最新試題
The boat is stowed on the davit rather than on a cradle with which type of davit?（）
Permission is kindly requested（）the ballast water.
On a ship，a door that is required to be marked KEEP CLOSED is designed to（）.
An example of a messenger is a（）.
In nautical terminology a dog is a（）.
The holding capability of an anchor is primarily determined by the（）.
Centrifugal pumps have what advantage(s) over reciprocating pumps?（）.
The most common type of davit found on merchant vessels today is the（）.
Cargo pump relief valves are piped to the（）.
The function of the bypass valve on the self-contained breathing apparatus is to（）.