2.Significant variables of the smoking process

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2.Significant variables of the smoking process

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] >>


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