知识贝壳
知识贝壳
所属栏目：英汉烟草科技
One extensive study of the effect of filter ventilation on smoke component deliveries has been published. The tips used ranged in level ofventilation from 20% to 70%. It was shown that the level of ventilationremained essentially constant through the smok ......（本文共 8623 字 , 14 张图） [阅读本文] >>