煤制气高级

下列钢材中，焊接性能最好的是﹙ ﹚。

发布于 2021-02-17 09:01:41

【单选题】
A 45#
B 10#
C cr5mo
D 4cr13

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LM1998 2023-02-17

这家伙很懒，什么也没写！

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