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16Mn属于(___)MPa级的低合金结构钢。

发布于 2021-03-06 01:49:08

【单选题】
A 300
B 350
C 400

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青云 2023-03-06

生命之长短殊不重要，只要你活得快乐，在有生之年做些有意义的事，便已足够。

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