随机抽取668名农户进行问卷调查，内容涉及施用农药的种类、频次、施药安全间隔期等。
The questionnaires were distributed to 668 families randomly in rural areas. The questions involve in the categories of the pesticides and frequencies of use and safe interval period and so on.
随机抽取668名农户进行问卷调查，内容涉及施用农药的种类、频次、施药安全间隔期等。
The questionnaires were distributed to 668 families randomly in rural areas. The questions involve in the categories of the pesticides and frequencies of use and safe interval period and so on.
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