皮棉 229和329 是什么意思?分别代表哪个等级的棉花?就是想搞清,一级、二级、三级、四级棉花是不是有别的代号?为什么不直接说一级或二级而要用代号呢?
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/15 09:42:22
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