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。
A kind of composite additive used for copper plating of chemical replacement on iron surface was investigated.
置换反应是中学化学中的主要反应，也是典型的氧化还原反应。
Metathesis reaction is not only one of the major reactions in secondary school chemistry teaching, but a typical REDOX reaction.
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。
Several exploitation methods for tapping NGH have been suggested, such as thermal activation, pressure releasing, chemical inhibitor, replacement and slurry mining.
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