Chloroform has obvious hepato-,nephro-toxicity and carcinogenicity,In order to get necessary data for recommendaiton of maxium allowable concentration of chlor
Ultrathin bronchofiberscope(Olympus BF-1.8T) was applied to the observation of the peripheral airways of total 87 cases,including 73 cases of quartz-exposed and
Human lymphocytes pre-exposed to 10 mGy or 50mGy of X-rays become less sensitive to subsequent large dose irradiation,exhibited lower rate of chromosome aberrat