Shiyan Sub-District [in Chinese] 石岩街道 Songgang Sub-District [in Chinese] 松岗街道 Shajing Sub-District [in Chinese] 沙井街道 ..
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采用随机整群抽样的方法,对深圳市宝安区松岗街道的学龄前儿童进行视力测查及影响因素调查。
Preschool students were selected by random cluster sampling from Songgang street of Bao an district in Shenzhen city.
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