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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Before starting to hoist provisions，which should be checked?（）
A.Hoist rope is not kinked
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