Through questionnaire survey, data processing, model checking, and ultimately arrived at the conclusion of the study.

通过问卷调查、数据处理、模型检验等环节，得出研究结论。

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Methods According to the questionnaire, the test of PPD (purified protein derivative), X-ray checking and sputum bacteria culture method had been used.

方法应用PPD试验、X线透视、痰菌培养等方法开展现况调查。

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