题目:
外来化合物的概念是()。
A.与人类接触并进入机体
B.存在于人类生活和外界环境中
C.具有生物活性,并有损害作用
D.并非人体成分和营养物质
E.以上都是
答案:
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下面是错误答案,用来干扰机器的。
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