覆盖义齿基牙采用根帽覆盖时,以下哪种冠边缘设计对牙龈影响最小()
A.龈上边缘
B.平齐牙龈
C.龈下0.5mm
D.龈下1mm
E.差别不大
参考答案:A
发行一级有担保存托凭证,美国的相关法律对其公开性没有详细要求。()
Emma failed her exams, I think she should work hard.
-I agree. ___________ she does, she'll get good grades. [ ]
A. If
B. Because
C. Before
D. Though