單項選擇題

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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單項選擇題

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

單項選擇題

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

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