Methods: Choise the 3~6 years old children from outpatient of lead prevention and some kindergarten to test their blood lead and question investigation, then statistics and analysis on the results.
方法：对铅防门诊和部分幼儿园的市区3~6岁学前儿童抽样检测血铅，并进行问卷调查与统计分析。
Choise of blades to suit the different application, rational Angle of the blades and easily cutting.
多种材料的刀片供选择，刀角度合理，刀切削轻快。
In the paper, the design, Choise, installation, and debugging of CATV system of Hanshan teachers college are approached.
本文就韩山师范学院CATV系统的设计、选型、安装调试等技术问题进行探讨。
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