单项选择题
A.Safe working load B.Ship's working lift C.Starboard wing lift D.Stress，weight，load
In nautical terminology a dog is a（）.A.crow barB.device...
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
If the engine of a survival craft does not start，check ...
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
If a gasoline engine turns over freely but will not sta...
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
