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linghanyuan(½ð±Ò+1,VIP+0):ÐÁ¿àÁË 12-29 20:55
ray27064690211(½ð±Ò+1,VIP+0): 1-11 19:42
linghanyuan(½ð±Ò+1,VIP+0):ÐÁ¿àÁË 12-29 20:55
ray27064690211(½ð±Ò+1,VIP+0): 1-11 19:42
| Oxygen is one of the most important elements on the earth£¬ÕâÑù²Å¶Ô |
2Â¥2009-12-27 19:33:33
babysanxing
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linghanyuan(½ð±Ò+1,VIP+0):¹ÄÀøÐ³æ 12-29 20:55
linghanyuan(½ð±Ò+1,VIP+0):¹ÄÀøÐ³æ 12-29 20:55
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»¹¿ÉÒÔÕâÑù Element oxygen is one of the most important (elements) on the earth, which occupied 53.8 % in crust of the earth and 21% of the atmosphere. |

3Â¥2009-12-29 13:23:45
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4Â¥2009-12-29 16:02:38
liuxing1-1
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linghanyuan(½ð±Ò+1,VIP+0):лл½»Á÷ 1-4 22:30
linghanyuan(½ð±Ò+1,VIP+0):лл½»Á÷ 1-4 22:30
| Oxygen is one of the most important elements on the earth, which occupied 53.8 % in crust of the earth and 21% of the atmosphere. |
5Â¥2009-12-29 21:31:34
zoujj
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sirljz(½ð±Ò+1,VIP+0):лл½»Á÷£¬»¶Óгæ 1-6 08:38
ray27064690211(½ð±Ò+1,VIP+0): 1-11 19:42
sirljz(½ð±Ò+1,VIP+0):лл½»Á÷£¬»¶Óгæ 1-6 08:38
ray27064690211(½ð±Ò+1,VIP+0): 1-11 19:42
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Oxygen, as one of the most important elements on the earth, occupies 53.8 % in the earthcrust and 21% in the atmosphere. Ã²ËÆÕâÑù¸üµØµÀһЩ£¿ |

6Â¥2010-01-05 16:12:10
myiris
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7Â¥2010-01-08 23:21:43
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8Â¥2010-01-08 23:33:30
xiaojuan7765
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9Â¥2010-01-09 14:06:24
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| Oxygen is one of the most important elements on the earth, which occupies by 53.8 % in the earthcrust and by 21 % in the atmosphere. |
10Â¥2010-01-12 14:21:08














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