this specification covers Chinese specification GB3077 20Cr steel 怎么翻译

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this specification covers Chinese specification GB3077 20Cr steel 怎么翻译
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this specification covers Chinese specification GB3077 20Cr steel 怎么翻译
this specification covers Chinese specification GB3077 20Cr steel 怎么翻译

this specification covers Chinese specification GB3077 20Cr steel 怎么翻译
很高兴能够在这里回答你的问题,这道题的正确答案应该为:
这本说明书包括中国国标3077合金钢结构钢规范.
20cr是合金结构钢 标准 GB/T 3077-1999