第一章
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1-1浩瀚的宇宙.pps 3.8 MB |
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1-2太陽系.pps 2.2 MB |
299-1-2太陽系.pps 2.2 MB |
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1-3晝夜與四季.pps 2.2 MB |
1-4月相與潮汐.pps 3.2 MB |
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