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义务教育初中物理教科书（人教版）第一册的若干说明（续二）人民教育出版社董振邦，马淑美第七章质量和密度质量和密度是两个联系密切的物理量，新教科书把它们放在一章讲述，学过质量后接着学习密度，比较顺理成章，也便于学生建立知识间的联系。一、淡化质量概念，突出...
A few notes on the first volume of compulsory education junior middle school physics textbooks (PEP) (Continued 2) People’s Education Press Dong Zhenbang, Ma Shumei Chapter VII Quality and Density Mass and density are two closely related physical quantities. New textbooks put them In one chapter, it is more natural to learn the quality and then study the density. It is also easier for students to establish the connection between knowledge. First, dilute the concept of quality, highlight...