常见例句No. 4 ore belt in Maquan gold deposit 馬泉金鑛牀四號鑛帶Characteristic of the associated element and the denuation degree in Maquan gold deposit, Gansu province 甘肅馬泉金鑛伴生元素特征及剝蝕程度研究Maquan gold deposit 馬泉金鑛牀 返回 Maquan