[名词解释] 分选得率

试述电化学发光法反应原理及其优点? 下列哪些是圆锥型套简冠义齿的非适应证() ["A．年轻恒牙患者","B．猛性龋患者","C．夜磨牙、致牙冠严重磨耗","D．牙周炎治疗后仍二度松动","E．多数牙缺失单颌牙下列仅剩2颗天然牙"] 圆锥型套筒冠义齿基牙制备时，颈部可制备成() ["A．刃状","B．90度肩台","C．135度肩台","D．斜面型肩台","E．浅凹斜面型"] 荧光信号 前向散射光 分选得率