Teflon, polyethylene, and sapphire are examples of good quality insulators, but avoid materials like phenolics and nylon.
特富龙、聚乙烯和蓝宝石是高质量绝缘材料的例子，但要避免使用酚醛塑料和尼龙等材料。
Teflon, polyethylene, and sapphire are examples of good quality insulators, but avoid materials like phenolics and nylon.
特富龙、聚乙烯和蓝宝石是高质量绝缘材料的例子，但要避免使用酚醛塑料和尼龙等材料。
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