Rubber plunger should not be rubber thread, rubber chipping, foreign impurity, spray frost.
橡胶活塞应无胶丝、胶屑、外来杂质、喷霜。
The metallic impurity contents required by some foreign carbon plants were introduced, which were compared with the carbon companies in China.
介绍了国外某些工厂对金属杂质含量的要求，对比了我国目前延迟焦金属杂质的状况。
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