全国吸烟者,男性占52.9%。那么在男性中,吸烟者占多少%?怎么也得70%以上吧。如果是均匀分布,男患者中有吸烟史的~70%
本帖于 2020-02-12 11:43:43 时间, 由普通用户 40er 编辑
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