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当前学科:M6维护技术基础
题目:
单选
钢中锰的作用()。
A . A.消除硫的不利影响,改善钢的韧性。
B . B.提高钢的屈服强度。
C . C.使钢变脆。
D . D.抵消硅的作用。
答案:
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