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| principal load; primary load | |||
| 主荷载: 21 phrases in 8 subjects |
| Aviation | 2 |
| Bridge construction | 7 |
| Engineering geology | 1 |
| Navigation | 1 |
| Oil / petroleum | 1 |
| Space | 4 |
| Technology | 4 |
| Wind Energy | 1 |
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