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（）.<br>A:5% or less<br>B:10% or less<br>C:15% or less<br>D:20% or less

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

出自：海船船员证

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