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观察对象为沈阳市126中学小学部一年级学生5个班级共245人,其中实验组3个班级143人,对照组2个班级102人.沈阳市饮水中氟含量约为0.21ppm.
The observation object was 126 primary school students in Shenyang City, 126 primary and secondary schools, a total of 245 five classes, of which 143 were experimental group of three classes, control group of two classes 102. Shenyang drinking water fluorine content of about 0.21ppm.