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

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单项选择题

A.a defective ignition system
B.low lube oil level
C.weak valve springs
D.too heavy a load

单项选择题

A.once each crankshaft revolution
B.twice each crankshaft revolution
C.every other crankshaft revolution
D.every fourth stroke

单项选择题

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