题型:填空题 患者,女,8岁,第一磨牙呈近中尖对尖咬合,下颌双侧第二乳磨牙龋坏。如下颌双侧第二乳磨牙拔除后,其缺隙保持器不宜选择 ()A.丝圈式保持器B.托牙保持器C.固定桥保持器D.舌弓保持器E.活动保持器 查看答案
题型:填空题 The shepherd had to round up the sheep ________ first night fell.[ ]A. until B. before C. after D. till 查看答案