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靶材为什要测量密度?秒准靶材密度计的优势在哪里?靶材本身的致密度,靶材的致密度很高时,不易吸附,无空隙,背靶易脱.
2022
K金是什么意思,怎么检测黄金K数?黄金纯度成色(K数)无损检测方法。黄金K数的定义:用"k金"表示黄金的纯.
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