如何鉴别一块玉的质量?听说拿一根头发放在玉上,用火烧一下头发丝也不会断,是不是真的啊!那请问我所说的方法算不算有效的啊!

来源:学生作业帮助网 编辑:作业帮 时间:2024/08/12 06:19:08
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