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"Resources and Environment Carrying Capacity and Reasonable Population Capacity" Population Distribution, Migration and Reasonable Capacity PPT Download
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"Make an Ecological Bottle" Biology and Environment PPT Courseware 3
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"Chemistry and Environmental Protection" Chemistry and Social Development PPT teaching courseware
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"Gas Exchange between the Human Body and the External Environment" PPT courseware
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"Hydosphere and Water Cycle" Looking at the Surface Environment from the Earth's Sphere PPT (Lesson 2)
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"Ideal Living Environment" PPT courseware
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PPT courseware on gas exchange between the human body and the external environment
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