由椿游路线组成两类问卷，并采用单一测试模型抽样调查。

Two kinds of questionnaire and single testing model were used to conduct a random sampling survey.

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由椿游路线组成两类问卷，并采用单一测试模型抽样调查。

Two kinds of questionnaire and single testing model were used to conduct a random sampling survey.

youdao