提示安徽淮北地区不存在燃煤污染型地方性氟中毒。
The results showed that there was not coal-pollution-burned endemic fluorosis in north of Huai River, Anhui.
安徽淮北平原宜井灌溉面积占总耕地面积近80%。
Suitable well-irrigation is about 80% of the total farmland area in north Huaihe River plain of Anhui province.
方法采用分层随机抽样方法，抽取安徽省淮北市4所中学的310名教师，采用教师职业倦怠量表（MBI-ES）进行调查。
Methods A total of 310 teachers from 4 middle schools in Huaibei City were selected with stratified random sampling to undergo a survey with teacher job burnout questionnaire(MBI-ES).
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