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| 正弓形拱 | |||
| 正〔弓形〕拱 | |||
| 支撑式拱顶 | |||
| 拱式炉顶; 炉拱; 悬拱; 弓形拱; 工业炉落地拱; 起拱点; 已砌的拱 | |||
| sprung arch: 4 phrases in 1 subject |
| Metallurgy | 4 |
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