方法在北京市石景山区随机整群抽取3所学校初一到高二学生1 650人，匿名自填问卷调查。
Methods an anonymous questionnaire survey was conducted among 1 650 students drawn randomly from 3 middle schools in Shijingshan County, Beijing using a clustered sampling method.
台京学校位于石景山区衙门口村西南后街。
Taijing School is located in the Nhorth-west Back Street of Yamenkou Village, Shijingshan District.
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