知识贝壳
知识贝壳
所属栏目：英汉烟草科技
The ventilation or air dilution of cigarette smoke results in an overallreduction in smoke delivery. Both particulate delivery and vapor-or gasphase deliveries are reduced,generally in direct proportion to the level ofventilation. Diluting air can be intr ......（本文共 2515 字 , 2 张图） [阅读本文] >>