题目内容
(请给出正确答案)
[主观题]
Natural sources of radiation are______.A.radioactive potassium in bones, strontium 90, ura
Natural sources of radiation are______.
A.radioactive potassium in bones, 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
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