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1 调查内容及方法1·1 调查对象 本文调查在哈尔滨市进行。选取小学六年级学生、初中二年级学生、高中二年级学生、20～60岁的工人及孕产妇各100名作为调查对象。1·2 调查方法 对上述调查对象进行现场问卷式调查,现场填写调查表格。1·3 调查内容 本次调查主要是不同人群对食品含钙量的
1 contents and methods of investigation 1.1 The survey This survey was carried out in Harbin. Sixth grade primary school students, second-year middle school students, sophomores, 20 to 60-year-old workers and 100 maternal women were selected as the survey subjects. 2.2 Survey Method Conduct on-site questionnaire survey of the above survey subjects and fill in the survey form on the spot. 1.3 The content of the survey The survey is mainly different groups of food calcium content