Four, and then the (AC) region of the L, N access to the 220V power supply (2.5 of copper core wires), such as the installation position is low, the best grounding wire.
再将变压转换器的（AC）区域的L、N接入220V电源（2.5的铜芯电线），如安装位置较低，最好接上地线。
The result for treatment of NH 3-N wastewater by catalyst wet oxidation showed that the co-catalyst has higher activity and the good inhibition for copper dissolution.
实验结果表明，新制备的复合催化剂氧化活性显著提高，并有效地抑制铜的溶出。
Copper layer of different colour can be electrodeposited from a copper sulfate solution containing n-butyl alcohol and hydrogen peroxide.
在含有正丁醇和过氧化氧的硫酸铜溶液中可以获得不同颜色的镀层。
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