A.crow bar
B.device to force a water tight door against the frame
C.heavy steel beam
D.wedge
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A.that the fuel valve is open
B.if the air supply system is open
C.if the water sprinkler system is open
D.if the limit switch is on
A.a defective ignition system
B.low lube oil level
C.weak valve springs
D.too heavy a load
A.once each crankshaft revolution
B.twice each crankshaft revolution
C.every other crankshaft revolution
D.every fourth stroke
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
最新試題
Static electricity may be built up by the（）.
In the piping systems of a vessel，what type of valve gives the least resistance to fluid flow when fully open?（）.
Limit switches are used on which davits?（）
In ship construction，frame spacing is（）.
In ship construction，keel scantlings should be the greatest（）.
In nautical terminology a dog is a（）.
In ship operations，hoisting and lowering pipe in and out of the drilled hole is the main function of the（）.
The boat is stowed on the davit rather than on a cradle with which type of davit?（）
An example of a messenger is a（）.
The series of valves used to control the return flow in well control operations is called the（）.