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"Heat Engine" Mechanical energy, internal energy and their conversion PPT courseware 4
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"What's in the Soil" Earth's surface and its changes PPT
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"Organization and Review" PPT courseware on carry addition within 20
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"Monomials and Polynomials" PPT courseware
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"Carbon and Its Compounds" Fuel and Combustion PPT Courseware 2
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"Mechanical Energy and Its Transformation" Work and Mechanical Energy PPT Download
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《Sodium oxide and sodium peroxide》Sodium and its compounds PPT
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"Carbon and Its Compounds" Fuel and Combustion PPT Courseware 3
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"Eyes and Glasses" Lenses and Their Applications PPT Courseware 2
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