单项选择题
Combustible gas indicators operate by drawing an air sample into the instrument（）.
A.over an electrically heated platinum filament
B.where it is mixed with nitrogen
C.where it is ignited by a sparking device
D.where its specific gravity is measured
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Butadiene，inhibited，is labeled as a（）.
A.combustible liquid
B.flammable gas
C.flammable liquid
D.flammable solid -
单项选择题
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
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单项选择题
Before entering a tank，always check the vapor content（）a combustible gas indicator.
A.with
B.by
C.of
D.for
