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"Utilization and Protection of Metal Resources" Metal and Metal Materials PPT Courseware 3
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"Utilization and Protection of Metal Resources" Metal and Metal Materials PPT Courseware 3
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"Development, Utilization and Protection of Water Resources" The most common liquid - water PPT courseware
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3D three-dimensional style circular arrow slide chart material
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"The Human Body's Perception of the External Environment" Regulation of Human Life Activities PPT Courseware
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"Development, Utilization and Protection of Water Resources" The most common liquid - water PPT courseware
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"Utilization and Protection of Metal Resources" Metal and Metal Materials PPT Courseware 2
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"Utilization and Protection of Metal Resources" Metal and Metal Materials PPT Courseware 4
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"Know the law, abide by the law and safeguard rights in accordance with the law" The law protects our healthy growth PPT courseware
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"Air Pollution and Its Protection" Resource Protection and Environmental Crisis PPT Courseware 2
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"Earth's Cosmic Environment" Viewing the Earth from the Universe PPT Download (Lesson 1: The Universe)
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