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实验选用１１～１３周龄雄性大鼠，通过吸入染毒观察香烟主流烟雾（ＭＣＳ）对其细胞色素Ｐ４５０酶系某些酶活性的影响。将大鼠随机分为４组，每组３０只。两组染毒组，在ＭＣＳ设计浓度总颗粒物质（ＴＰＭ）为１００ｍｇ／ｍ３下吸入染毒，每天６ｈ。实际平均吸入浓度为１１?
In this study, male rats aged 11 ~ 13 weeks were selected to investigate the effects of mainstream cigarette smoke (MCS) on the activities of some enzymes in the cytochrome P450 enzyme system. The rats were randomly divided into 4 groups of 30 rats. The two exposure groups were exposed to MCS at a designed concentration of total particulate matter (TPM) of 100 mg / m3 for 6 h daily. The actual average inhalation concentration of 11?