题目内容：
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：
选择题：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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- 题目类型：选择题
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