恒温器是以不同的金属有不同的膨胀系数这一事实为根据的。

The thermostat is based on the fact that different metals have different coefficients of expansion.

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相较于金属和热塑材料，什么材料具有更高的热膨胀系数(CTE) ？

In contrast with metal and thermoplastic material, which has a higher coefficient of thermal expansion (CTE).

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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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