1.Indicate epidemiology investigation , confirm on the grounds of international sampling investigation, major part in the cancerogenic patient who has a smoke is a passive smoker.
流行病学调查表明,据国际性调查证实,吸烟致癌患者中大部分是被动吸烟者。
2.The title resin has been prepared by Friedel-Crafts acylation followed by bromination and amination.The method avoids the utilization of cancerogenic chloromethyl methyl ether.