A.Safe working load
B.Ship's working lift
C.Starboard wing lift
D.Stress，weight，load
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A.crow bar
B.device to force a water tight door against the frame
C.heavy steel beam
D.wedge
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
最新試題
In ship construction，keel scantlings should be the greatest（）.
In the piping systems of a vessel，what type of valve gives the least resistance to fluid flow when fully open?（）.
The function of the bypass valve on the self-contained breathing apparatus is to（）.
The most common type of davit found on merchant vessels today is the（）.
An example of a messenger is a（）.
If a gasoline engine turns over freely but will not start，the cause is generally（）.
In nautical terminology a dog is a（）.
An integral part of a blowout preventer that serves as the closing element on an open hole，and whose ends do not fit around the drill pipe but seal against each other and shut off the space below completely is the（）.
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.