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１９９７年，我们在张家港市杨舍镇采用点滴法对家蝇抗药性进行了调查。结果报告如下。调查方法 选择张家港市杨舍镇（市区所在地）东、南、西、北及中心地区蝇孳生场所（１９８８年采集蝇地点大致相同）现场采集家蝇集中到省卫生防疫站饲养、驯化一代后挑选羽化第４、５天?
In 1997, we investigated the drug resistance of house flies by using the drip method in Yangshe Town, Zhangjiagang City. The results are reported below. Survey method Choose Yangshe Town, Zhangjiagang City (where the urban area is located) Flies breeding places in east, south, west, north and central areas (collecting flies in 1988 roughly the same location) Collecting houseflies on the spot Concentrating on provincial health and epidemic prevention stations, after domestication Pick the emergence of 4,5 days?