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"Scientific Inquiry: Balance Conditions of Leverage" Machinery and Human PPT Courseware 4

Shanghai Science Edition 8th Grade Physics Download: 854

"Simple machinery on a bicycle" tools and machinery PPT courseware 4

Science Edition for Sixth Grade Science Volume 1 Download: 945

"The Secret of Axle" Tools and Machinery PPT Courseware 3

Science Edition for Sixth Grade Science Volume 1 Download: 778

"How to measure and express force" force and machinery PPT courseware

Guangdong and Shanghai version of eighth grade physics volume 2 Download: 726

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