Coal is the major energy resource in china and accounts for 74% of the primary energy constitution.Coal mining leads to ......

Objective To explore the digital technology of 3D printing applied in clinical artificial total hip arthroplasty and to ......

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目的比较间接粘结技术中使用两种不同转移托盘及不同牙列拥挤度时的托槽转移精确度。方法收集30名患者的上颌或下颌硬石膏模型，各取......