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释义
the world > matter > chemistry > chemical substances > named gases > [noun] > types (3)
permanent gas1800

a gas which can be liquefied only at very low temperatures (such as oxygen, hydrogen, or air), and was formerly believed to be incapable of…

carrier gas1887

a gas mixed with a volatile material so that it can be made to flow through an apparatus, e.g. as an inert vector in chromatographic analysis (cf…

flue-gas1898

any mixture of gases from the flues of chemical or smelting factories.

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