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"The Impact of Human Activities on the Biosphere" PPT download
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"Analysis of the Impact of Human Activities on the Ecological Environment" Impact of Human Activities on the Biosphere PPT Courseware 4
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"Analysis of the Impact of Human Activities on the Ecological Environment" Impact of Human Activities on the Biosphere PPT Courseware 2
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"Basic Characteristics of Climate" PPT
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"Climate Characteristics and Major Meteorological Disasters in my country" PPT
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"Temperature and Air Temperature" Weather PPT
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"Air and Oxygen" PPT download
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"Air and Oxygen" PPT courseware
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"Climate of the World" PPT courseware
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