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（）.

When fighting fires in spaces containing bottles of LPG (liquefied petroleum gas)，you should （）.

The vapor pressure of a substance（）.

Storage batteries should be charged in a well ventilated area because（）.

Compared to the amount of concentrated foam liquid used，the amount of low expansion mechanical foam produced is（）.

The vapor pressure of a gas is the pressure necessary to keep it in a(n)（）.

Before starting a gasoline engine on a motorboat，you should make sure for safety that（）.

Upon release to the atmosphere，LFG readily（）.

Gasoline tanks should be filled（）.

LFG tank and pipeline maintenance should include（）.