The pattern features of the cracks fractured in seam would not have a fixed depth limitation.
煤层压裂裂缝的形态特征没有固定的深度界限。
X-ray diffraction pattern features strong reflection on the odd basement layers and weak one on the even basement layers.
射线衍射谱的特征是基底奇数层反射强，而偶数层反射不明显。
X-ray diffraction pattern features strong reflection on the odd basement layers and weak one on the even basement layers.
射线衍射谱的特征是基底奇数层反射强，而偶数层反射不明显。
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