For here we can see that, rare-earth additive can remove harmful substances in liquid Cu effectively so that conductivity of non-oxygen copper pole is enhanced.
至此我们可以看出，稀土添加剂可以有效消除液态铜里的有害物质，所以提高了非氧化铜电极的导电率。
The shielding layer is a copper film provided with adhesives on one side, and is connected with the negative pole of the transducer.
所述的屏蔽层为一边带粘接剂的铜膜与换能器负极连接。
It points out that the direct spot welding of pure copper can be realized by the correct choice of pole material, pole form, welding equipment and criterion.
找出了用通常方法不能点焊纯铜的原因，介绍了纯铜点焊焊核形成的过程，指出以本文为依据正确地选择电极材料、电极形状、焊接设备和确定焊接规范，就可实现纯铜的直接点。
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