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| 陷落角 | |||
| 裂缝角在充分或接近充分采动条件下，移动盆地主断面上，地表最大的裂缝和采空区边界点连线与水平线在煤壁一侧的夹角 | |||
| 极限角; 牵引角; 临界角; 移动角; 崩落角 | |||
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angle of draw : 2 phrases in 1 subject |
| Explosives and Explosive Ordnance Disposal | 2 |
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