单项选择题

What is the purpose of the limit switch on gravity davits?（）

A.To cut off the power when the davits hit the track safety stops
B.To stop the davits from going too fast
C.To cut off the power when the davits are about 12 inches or more from the track safety stops
D.None of the above

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热门试题

单项选择题What is the most important difference between the bow type anchor shackle and the D-type anchor shackle? （）

A.The bow type shackle provides a superior connection
B.The D-type shackle is weaker than the bow type
C.The bow type shackle is weaker than the D-type
D.The D-type shackle provides an inferior connection

单项选择题What is the function of an air receiver in the compressed air system on a ship? （）

A.Condenses moisture
B.Provides overpressure protection
C.Purifies the air
D.Acts as an accumulator

单项选择题What is the female section of a tool joint called? （）

A.Stem
B.Pin
C.Box
D.Stand

单项选择题What is the best instrument for establishing a safe working area before welding in a confined space? （）

A.An oxygen indicator
B.A combustible gas indicator
C.A combination combustible gas and oxygen indicator
D.A flame safety lamp

单项选择题What is the BEST conductor of electricity?（）

A.Carbon dioxide
B.Distilled water
C.Fresh water
D.Salt water