单项选择题
In nautical terminology a dog is a（）.
A.crow bar
B.device to force a water tight door against the frame
C.heavy steel beam
D.wedge
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相关考题
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单项选择题
If the engine of a survival craft does not start，check to see（）.
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 -
单项选择题
If a gasoline engine turns over freely but will not start，the cause is generally（）.
A.a defective ignition system
B.low lube oil level
C.weak valve springs
D.too heavy a load -
单项选择题
Each cylinder in a two stroke cycle engine experiences combustion（）.
A.once each crankshaft revolution
B.twice each crankshaft revolution
C.every other crankshaft revolution
D.every fourth stroke
