香烟里含有尼古丁,尼古丁是什么东西?为什么人体为中毒?尼古丁存在哪里?尼古丁在吸烟的人体内多,还是二手烟人的体多?

来源:学生作业帮助网 编辑:作业帮 时间:2024/07/31 21:30:11
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