题型:填空题 患者男,45岁,缺失,松动,正常,拟行可摘局部义齿修复,其最佳设计方案是()A.对半卡环,三臂卡环B.三臂卡环,三臂卡环C.回力卡环,三臂卡环D.三臂卡环,回力卡环E.长臂卡,三臂卡环 查看答案
题型:填空题 Every year millions of trees _____ to prevent floods, droughts and sandstorms. [ ]A. plant B. are planted C. are planting D. were planted 查看答案