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随着教育事业的发展和教育改革的不断深入,使用现代化的教学手段已势在必行。过去在课堂上使用的黑板、挂图等辅助手段已远远不能满足高密
With the development of education and the deepening of education reform, the use of modern teaching methods is imperative. In the past in the classroom using blackboards, wall charts and other aids have been far unable to meet the high density