The rock quality evaluation can be taken as a pattern recognition or classification problem.

岩体质量评价问题可以认为是一个模式识别或分类问题。

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Rock mass elastic wave velocity is the synthesized reflection of rock quality, rock mass structure, and rock mass existing environment.

岩体弹性波速度是组成岩体的岩石性质、岩体结构、赋存环境的综合反映。

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RQD value, one of the rock quality indices, may become a new and practical way to accurately estimate the strength of broken rock mass.

RQ D值作为岩体质量指标之一，可为破碎岩体的强度估计提供新的实用途径。

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Naked' is coinciding with an increase in demand for guitar-based rock and quality pop, it is hoped that this new appeal to the young will be enduring.

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"When I started, geologists were considered heretics for dreaming that there could be salt canopies with reservoir-quality rock beneath them, " says Issen, 54.

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Now, anyone can have the chance to sit back or rock out while enjoying concert quality sound at home with thumping lows, sizzling highs and crystal-clear sound at any level.

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