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20
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Obama
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04:23
土壤力學030-二維卡氏座標系的逆時針旋轉作用矩陣
11
B2 High-Intermediate
US
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04:54
土壤力學002-土壤的定義
7
B1 Intermediate
US
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03:47
Soil mechanics
6
B2 High-Intermediate
US
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03:04
土壤力學006-土壤的含水比(w)、飽和度(s)、孔隙率(n)和孔隙比(e)定義
6
B1 Intermediate
US
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04:38
Soil mechanics
3
B2 High-Intermediate
US
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04:09
Soil mechanics
1
B1 Intermediate
US
WC
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