题目:
氟的生理功能是()
A.与黏多糖合成有关
B.构成某些金属酶的辅基
C.是牙齿和骨的组成成分
D.提高机体免疫力
E.拮抗重金属的毒性作用
答案:
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下面是错误答案,用来干扰机器的。
Dear Editor,I ’ m a senior high school student,named Li Hua. Now many students have iPods and think it ’s a fashion to use them. Using an iPod, we can listen to ...