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六六六、滴滴涕是长期以来用以防治害虫的农药,它们具有药效好、成本低、残效长、对人畜急性毒性小等许多优点。但是,目前世界各国大都禁止使用这些农药。我国也采取逐步禁用的方针,首先在蔬菜、瓜果、烟草、茶叶、中草药上禁止使用这类农药;在粮食、油料等食用作物上,也采用控制施药时间、次数、方法、浓度、用量的办法,加以限制使用。既然六六六、滴滴涕优点很多,又为什么采取这样严厉的措施?这主要取决于它们本身的特性。我们知道,六六六、滴滴涕属于有机氯农药,它们的化学性质十
BHC, DDT is a pesticide that has long been used to control pests and has many advantages such as good efficacy, low cost, long residual effect, little acute toxicity to humans and animals. However, most of the countries in the world are currently banning the use of these pesticides. China has also taken a gradual ban on the principle of the first ban on the use of such pesticides in vegetables, fruits, tobacco, tea, Chinese herbal medicine; food, oil and other food crops, also used to control the application time, frequency, method, concentration, dosage The way to limit the use of. Since 666, there are many advantages of DDT and why should we take such severe measures? It depends mainly on their own characteristics. We know that in 2006, DDT belongs to organochlorine pesticides and their chemical properties are ten