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單項(xiàng)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

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單項(xiàng)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

單項(xiàng)選擇題

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

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