单项选择题

Blocks and falls used as lifeboat gear must be designed with a minimum safety factor of（）.

A.4，based on the breaking strength
B.5，based on the maximum allowable stress
C.6，based on the maximum working load
D.8，based on the normal working load

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单项选择题

BHP stands for the（）of the main engine.

A.breadth dimension
B.builder's name
C.brake horsepower
D.revolutions per minute

单项选择题

Before starting to hoist provisions，which should be checked?（）

A.Hoist rope is not kinked
B.Multiple part lines are not twisted around each other
C.The hook is centrally located over the load
D.All of the above