单选题Blocks and falls used as lifeboat gear must be designed with a minimum safety factor of（）.A4，based on the breaking strengthB5，based on the maximum allowable stressC6，based on the maximum working loadD8，based on the normal working load
单选题
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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