Presence of Rn, U and Pb in environment is a ubiquitous hazard to human health.
环境中的氡、铀和铅等有害微最元素严重危害人类健康。
Many Pb-Zn-Ag deposits are found in the middle north margin of North China Block.
河北丰宁营房铅锌银矿床产于一近南北向的中型韧性剪切带中。
Many Pb-Zn-Ag deposits are found in the middle north margin of North China Block.
河北丰宁营房铅锌银矿床产于一近南北向的中型韧性剪切带中。
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