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| 门窗洞口安装门窗框的槽沟 | |||
| 门窗内侧呈八字形斜壁; 门窗框槽沟; 门窗洞侧墙面; 木梁的嵌槽口 | |||
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sconcheon : 4 phrases in 2 subjects |
| Bridge construction | 1 |
| Technology | 3 |
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