2.Significant variables of the smoking process
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2.Significant variables of the smoking process图片（共4张） :

        The puffing habits of smokers are unique to each person,vary withhis emotional state,and have a strong effect on the amount of smoke produced. The amount of smoke produced per cigarette is highly dependenton the number of puffs taken and the volume of the......（本文共 1468 字, 4 张图）     [阅读本文] >>