玉与玛瑙如何鉴别在我眼里玉和玛瑙都是晶莹剔透.要怎么才能鉴别出玉和玛瑙呢.当然我这里是说的不用任何器械的.就是就一般的眼法和常规手段.

来源:学生作业帮助网 编辑:作业帮 时间:2024/07/29 18:46:19
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