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Please recommend several websites to download junior high school physics courseware for free.
Free download of Baidu network disk resources for junior high school physics courseware

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? Pwd=2chq extraction code: 2chq junior high school physics complete courseware | Nine physics knowledge points (gifts) | Nine physics courseware | Eight physics courseware | Eight physics courseware | Chapter 1? Mechanical movement | Chapter 5? Lens and its application | Chapter 4? Light phenomenon | Chapter 3? Change of state | Chapter 6? Mass and density | Chapter 2? Sound Phenomenon | Eight Knowledge Points Strengthening Courseware (Gift) |9. Solidification characteristics and solidification exotherm. ppt|8。 Temperature, thermometer. ppt