单选题All engines in lifeboats and rescue boats shall be run for a total period of not less than（）in weekly inspections.A2 minutesB3 minutesC4 minutesD5 Minutes
单选题
All engines in lifeboats and rescue boats shall be run for a total period of not less than（）in weekly inspections.
A
2 minutes
B
3 minutes
C
4 minutes
D
5 Minutes
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