單項選擇題

Butadiene，inhibited，is labeled as a（）.

A.combustible liquid
B.flammable gas
C.flammable liquid
D.flammable solid

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單項選擇題

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

單項選擇題

Before entering a tank，always check the vapor content（）a combustible gas indicator.

A.with
B.by
C.of
D.for