题目内容

根据开采水平数目,井田开拓方式分为单水平开拓和_______开拓。

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管道当量粗糙度考虑了管道形状损失的影响,一般比绝对粗糙度大2~11%。The equivalent roughness of pipeline takes into account the influence of pipeline shape loss, which is generally 2~11% higher than the absolute roughness.

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