不是下颌第一磨牙特点的是()。
A.牙冠近远中径大于颊舌径
B.有5个牙尖
C.牙冠颊面宽度大于舌面
D.面发育沟呈“田”字形
E.牙冠为下颌磨牙中最大的
参考答案:D
This school doesn't have ______ that one does. [ ]
A. as many students as
B. many as students as
C. such few students as
D. so many as students as
凸形竖曲线极限最小半径确定的考虑因素包括()。
A.缓和冲击
B.经行时间不宜过短
C.满足视距的要求
D.前灯照射距离要求