单项选择题

Each ship having an inert gas system must have a portable instruments to measure concentrations of hydrocarbon vapor in inert atmospheres and also to measure（）.

A.nitrogen
B.oxygen
C.carbon dioxide
D.water vapor

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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
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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