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| U 形断面 | |||
| 型截面 | |||
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| U形截面〔剖面〕 | |||
| 深槽 | |||
| U 形断面型材; U 形型材; U 形断面 | |||
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U section : 8 phrases in 4 subjects |
| Explosives and Explosive Ordnance Disposal | 1 |
| Hydroelectric power stations | 3 |
| Nautical | 1 |
| Technology | 3 |
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