他们将容器充满由蒸发液态氮和液态氧得到的纯空气，再加入水蒸气和一些痕量气体。
They fill the container with pure air made by evaporating liquid nitrogen and liquid oxygen, and add water vapour and some trace gases.
用于运输压力大于25ps ig (40psia)的液态氮的容器需要按照DOT规范设计、制造和检测。
Containers used for transporting liquid nitrogen at pressures greater than 25 psig (40 psia) need to be designed, manufactured, and tested to DOT specifications.
用于运输压力大于25ps ig (40psia)的液态氮的容器需要按照DOT规范设计、制造和检测。
Containers used for transporting liquid nitrogen at pressures greater than 25 psig (40 psia) need to be designed, manufactured, and tested to DOT specifications.
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