硒是湘黔汞矿带标型微量指示元素。
Selenium is the guide trace element in the western Hunan - eastern Guizhou mercury deposit.
人体骨骼中微量元素已经广泛地应用为重建古代食物结构、生存方法、经济生活变化的指示剂。
Trace elements in human bones have been widely used as indicators to reconstruct ancient diet, subsistent pattern and economic change.
以铬黑t (T)为主要原料，通过正交试验，筛选出微量硬度指示剂的新配方。
Taking chrome black t (t) as main material, a new prescription of trace hardness indicating agent has been screened out through orthogonal test.
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