题目内容：
不能提高淬透性的合金元素是（）。A．Mn
B．Si
C．Ni
参考答案：
单选：不能提高淬透性的合金元素是（）。
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A．Mn
B．Si
C．Ni
A．Mn
B．Si
C．Ni
请选出划线部分读音不同的选项（ ）。
请选出划线部分读音不同的选项（ ）。
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