题目放射性核素131I的半衰期是( )A. 6.02 hB. 3 hC. 8 hD. 109.8minE. 8 d放射性核素131I的半衰期是( )A. 6.02 hB. 3 hC. 8 hD. 109.8minE. 8 d题目解答答案E.8 d