单选题Before starting a gasoline engine on a motorboat，you should make sure for safety that（）.Athe gasoline tank is fullBthe bilges，cabins，etc. are thoroughly ventilatedCyou have fresh water on boardDEach of the above is followed
单选题
Before starting a gasoline engine on a motorboat，you should make sure for safety that（）.
A
the gasoline tank is full
B
the bilges，cabins，etc. are thoroughly ventilated
C
you have fresh water on board
D
Each of the above is followed
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