by-product gas
... 副电源：secondary power supply 副产气体：by-product gas 复制显示器：duplicate indicator ...
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炼油厂和石油化工生产中生成各种副产气体。
Refinery and petrochemical operation produce a variety of byproduct gases .
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Refinery and petrochemical operation produce a variety of byproduct gases.
The most valuable use of refinery gas is for hydrogen production.
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