但是国内品牌过多、过杂，不利于与外国品牌的竞争。
But there are not enough well known domestic brands to compete against the foreign brands.
在配方确定以后，原料的档次与含杂量对陶瓷PT C过流保护元件的性能有极大的影响。
After the prescription has been settled, the grade of raw materials and the content of impurities have great influence on the properties of the ceramic PTC overcurrent protective elements.
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