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| 地层振动合成速度如果地层振动速度已在三个相互垂直方向加以测定，则可用矢量代数求出合振动的大小和方向，单位为 mm/s | |||
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resultant ground vibration velocity : 2 phrases in 1 subject |
| Explosives and Explosive Ordnance Disposal | 2 |
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