我国工程岩体分级标准中,岩石的坚硬程度是按照下列哪个指标划分的? A.岩石的饱和单轴抗压强度 B.岩石的抗拉强度 C.岩石的变形模量 D.岩石的粘结力
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请根据听到的内容作答__________ A. The woman will go to ask Alan Green to answer the phone.
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