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直拉硅晶体过程中会引入各种杂质，有些杂质对材料有害，有些杂质对材料有益。

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直拉硅晶体过程中会引入各种杂质，有些杂质对材料有害，有些杂质对材料有益。

A.正确

B.错误

参考答案:

答案：正确

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