单项选择题
Each inert gas system must be designed to supply the cargo tanks with a gas，or mixture of gasses，that has an oxygen content by volume of（）.
A.5% or less
B.10% or less
C.15% or less
D.20% or less
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Compared to the amount of concentrated foam liquid used，the amount of low expansion mechanical foam produced is（）.
A.97 times greater
B.94 times greater
C.10 times greater
D.2 times greater -
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 -
单项选择题
Butadiene，inhibited，is labeled as a（）.
A.combustible liquid
B.flammable gas
C.flammable liquid
D.flammable solid
