同时，催化剂的贵金属含量较低。

Meanwhile, noble metals contents in catalysts was low.

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目的对低贵金属含量合金铸造精确程度进行比较评价。

Objective To evaluate the casting accuracy of two low-noble dental alloy systems.

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结果表明：排放劣化车催化器中的贵金属含量普遍低于新鲜催化器中的贵金属含量；

The results indicated that the noble metal content in catalytic converter of high emission vehicle is lower than the one in new catalyst converter;

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