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Which of the following,according to the passage,is a list of three natural sources of radiation?( )
A.Radioactive potassium in bone,strontium 90,uranium ore.
B.Carbon 14 in tissues,cosmic rays,X rays.
C.Cosmic rays,radioactive potassium in bones,radioactive carbon in tissues.
D.X rays,carbon 14,plutonium.
B.Carbon 14 in tissues,cosmic rays,X rays.
C.Cosmic rays,radioactive potassium in bones,radioactive carbon in tissues.
D.X rays,carbon 14,plutonium.
参考答案
参考解析
解析:细节题。根据文章第一段首句可知,辐射有三种自然来源,即环境中的放射性物质如土壤、岩石或建筑材料,宇宙射线,以及人体内的物质,如骨骼中的放射性钾以及组织中的放射性碳,C项正确。
更多 “ Which of the following,according to the passage,is a list of three natural sources of radiation?( ) A.Radioactive potassium in bone,strontium 90,uranium ore. B.Carbon 14 in tissues,cosmic rays,X rays. C.Cosmic rays,radioactive potassium in bones,radioactive carbon in tissues. D.X rays,carbon 14,plutonium.” 相关考题
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已知某国国际收支平衡表中,经常项目差额160亿美元,资本和金融项目差额为-100亿美元,误差与遗漏为1o亿美元,则该国储备资产增减额为( )。A.70亿元
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