Blocks and falls used as lifeboat gear must be designed with a minimum safety factor of（）.<br>A:4，based on the breaking strength<br>B:5，based on the maximum allowable stress<br>C:6，based on the maximum working load<br>D:8，based on the normal working load

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

出自：海船船员证

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