下颌磨牙的牙冠成长方形,近远中径大于颊舌径,关于下颌第一磨牙。
其牙合面形态可以是()
A.远舌尖直角形
B.窄长斜方形
C.三角形
D.田字形
E.长方形
参考答案:E
—Look at the boy running on the ground. Is it David?
—It _____be him. I saw him go to the teacher's office just now. [ ]
A. might
B. could
C. can't
D. mustn't
骨转移癌病人血钙浓度增高原因为()
A.长期卧床缺钙
B.病理骨折可释放钙
C.低蛋白血症,致血液中游离钙浓度升高
D.溶骨性破坏
E.类甲状旁腺素分泌高