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厄尔尼诺现象 |
1.03KB |
TXT |
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观察日蚀的方法 |
184BT |
TXT |
|
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哈雷慧星 |
229BT |
TXT |
|
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恒星的亮度 |
218BT |
TXT |
|
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南极臭氧洞 |
539BT |
TXT |
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彩虹 |
147BT |
TXT |
|
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化石 |
375BT |
TXT |
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黄土高原 |
1.25KB |
TXT |
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内蒙古大草原 |
558BT |
TXT |
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水土流失的危害 |
1.15KB |
TXT |
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中国的地震 |
414BT |
TXT |
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反射 |
405BT |
TXT |
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钱塘潮的形成 |
1.10KB |
TXT |
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天然气 |
266BT |
TXT |
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完全燃烧 |
250BT |
TXT |
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折射 |
352BT |
TXT |
|
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自然选择 |
274BT |
TXT |
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TXT |
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TXT |
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