A kind of composite additive used for copper plating of chemical replacement on iron surface was investigated.

研究了一种用于钢铁基体化学置换镀铜的专用复合添加剂。

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Several exploitation methods for tapping NGH have been suggested, such as thermal activation, pressure releasing, chemical inhibitor, replacement and slurry mining.

现有的多种天然气水合物开采方案，如热激法、减压法、化学抑制剂法、置换法和混合开采法等。

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Several kinds of nicotine replacement products provide small amounts of the chemical. These can help people stop smoking.

有几种尼古丁的替代品提供少量的化学品，来帮助人们戒烟。

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Nicotine replacement products provide the body with small amounts of the chemical through forms other than cigarettes.

VOA: special.2010.03.09

President Obama had also promised to build a modern Chemical and Metallurgy Research Replacement facility for handling plutonium which was included in the Treaty Resolution of Ratification and presented in his message to the Senate upon entry of the treaty into force.

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"Stocks of fire-fighting foam containing this chemical have been phased out at Guernsey Airport now that a suitable replacement has become available, " added Deputy Flouquet.

BBC: Assurances over Guernsey water