“一山有四季”的形成原因是[ ]
A.地形因素
B.纬度因素
C.海陆因素
D.季风影响
答案:A
- Mr. White, will you please teach me how to perform pair skating today?
-- . You have to practise single skating well first.
A.Two heads are better than one.
B.Think twice before you do.
C.Learn to walk before you run.
D.One today is worth two tomorrows.
男性,30岁,缺失3个月,残冠,已作根管充填。
若近中倾斜,采用固定桥修复的难点是()。
A.获得共同就位道
B.基牙支持
C.恢复咬合关系
D.桥体设计
E.固定桥的强度