【摘 要】
：
Objective To find out the status of drinking-waterborne endemic fluorosis and the effect of preventive measures in Hebei Province,so as to provide a basis to pr
【机 构】
：
Instit Endemic Dis Contr,Hebei Prov Center Dis Contr & Prev,
【出 处】
：
China Medical Abstracts(Internal Medicine)
论文部分内容阅读
Objective To find out the status of drinking-waterborne endemic fluorosis and the effect of preventive measures in Hebei Province,so as to provide a basis to prevent and cure fluorosis.Methods One affected county(city,district)with drinking-water-borne endemic fluorosis was sampled in every city and 10 water improvement projects were investigated in that county.Three villages were taken out in every county.The operating state of the projects,the water fluoride content,
Objective To find out the status of drinking-waterborne endemic fluorosis and the effect of preventive measures in Hebei Province, so as to provide a basis to prevent and cure fluorosis. Methods One affected county (city, district) with drinking-water-borne endemic fluorosis was sampled in every city and 10 water improvement projects were investigated in that county.Three villages were taken out in every county. The operating state of the projects, the water fluoride content,
其他文献
柴达木既是我国沙漠分布最高的盆地，也是矿产资源贮量多、品位高的“聚宝盆”。随着经济建设向西部的转移，资源开发与环境保护已是广大有识之士关注的重大问题。本文根据１９９４～１９９５年全省
定州西汉中山怀王墓出土竹简《论语》（以下简称《简论》），据目前所能见到的资料来看，应该是《论语》最早的存本，具有很高价值，尤有助于传世《论语》校勘。下面揭示二则，以就正于同好
应用林木球果采集机可以在基本不损伤母树的前提下，进行大面积机械化采集林木球果．对森林生态保护、森林更新、减轻工人劳动强度、保证工人安全、提高采种效率等方面都有重要意
他只有9％的脂肪，原地起跳1．15米，助跑摸高3．85米，空中飞行距高达7．5米，可以随心所欲地表演各种扣篮动作。这是谁？迈克尔·乔丹吗？错了！1989年夏季，洛杉矾的篮球训练营举办了一次趣味扣篮
采用径流小区定位观测法测定广西桂平市金田林场马尾松工程林林地的水土及养分流失量。结果表明，挖大穴整地造林林地年平均水流失量比荒坡地的低１５２％，泥沙流失量比全垦和带状整地
通过多年垂钓实践和观察,我认识到海鱼与河鱼有许多共性的活动规律。首先是两种鱼都喜欢在礁石、草丛、沉船、木桩、瓦砾间进行觅食藏身;其次是它们的集群活动;再次是它们都
在浙江省的马尾松、黑松、湿地松、火炬松、黄山松上采集到为害嫩梢和球果的蛾类昆虫12种，危害严重的有微红梢斑螟、松实小卷蛾和油松球果小卷蛾，火炬松严重受害、湿地松则轻微
1 直联真空泵的负载特点按照国际标准,油浸式直联真空泵不但应达到各项规定的真空指标,而且真空泵最低启动温度应不高于10℃,在环境温度5-40℃和相对湿度不大于90%的条件下
到北方来以后,我钓到过多种鱼,如鲫鱼、草鱼、鲢鳙、鲂鱼、嘎鱼、鲇鱼、黑鱼、罗非鱼、甲鱼和鳜鱼(花鲫)等,在美国钓到过鲤鱼、鲇鱼、多种鲈鱼和多种鳟鱼以及羊头鱼(sheephe
研究了生产H08Mn2Si 高速线材控轧控冷工艺参数,分析了终轧温度和冷却速率对力学性能的影响,得出最佳工艺为终轧温度850 ℃,760 ～580 ℃之间的冷却速度< 1 ℃/s。
The effect