方法采用分层多阶段随机抽样法，获取样本。并采取问卷的形式进行调查。
Methods Multistage sampling and stratified sampling were used and information was gathered by interview with questionnaires.
针对序贯概率比检验（SPRT）无法控制抽取样本量等不足之处，提出了一种改进的抽样检验方法——序贯网图检验。
This paper proposed a new sampling plan, the sequential mesh test, in order to overcome the disadvantages of the widely used Sequential Probability Ratio Test (SPRT).
根据竹螟幼虫分布的特点，确定了不同密度下的最适抽样数、序贯抽样的应用和调查取样方法。
The optimum sampling number, the sequential sampling application and the sampling method at different densities were determined based on the characteristics of the larva's distribution.
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