因此，研究者们转而使用两层含石墨的导电性聚碳酸酯，各层的内外层都附有一条金属带。

So instead the researchers use two layers of graphite-rich conductive polycarbonate, each flanked by a single metal strip in the inner and outer cladding.

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金属铜与塑料的膨胀系数比较接近，因此，在塑料电镀中常用化学镀铜层作为电镀的导电镀层。

Copper and plastic coefficient of expansion, and, therefore, more close to the plastic used in electroplating electroless copper plating coating layer as conductive.

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试验探棒还需穿过在表面覆盖一层非导电涂层如瓷釉或清漆的接地金属外壳的开口。

The test probe is also applied through openings in earthed metal enclosures having a nonconductive coating such as enamel or lacquer.

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