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| 双柱桁架 | |||
| 双竖杆桁架; 双柱上撑式桁架双柱托架 | |||
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| 双柱上撑式桁架; 双竖杆桁架 | |||
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| 双柱桁架 | |||
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queen-post truss : 12 phrases in 2 subjects |
| Architecture | 3 |
| Technology | 9 |
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