The source of "essential safety" is textually researched.
考查“本质安全”一词的出处；
This paper presents water content analyse to help find water source and insure safety.
采用水质分析法对水化学类型进行判别，从而找到了水源，确保了安全生。
Operation safety of the air separation unit is the key link in the production of oxygen, which is a risk source of most difficult to control.
空分装置的安全运行是工业制氧安全生产的关键环节，也是最难控制的危险源。
Operation safety of the air separation unit is the key link in the production of oxygen, which is a risk source of most difficult to control.
空分装置的安全运行是工业制氧安全生产的关键环节，也是最难控制的危险源。
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