若1≤a-b≤2,2≤a+b≤4,则5a-b的取值范围是( )。
[7,14]
54岁,患者,男性,上颌为无牙颌,下颌全天然牙,上颌全口义齿修复1个月后,腭侧中部出现了一条纵折裂线。
造成纵折的最主要原因是()
A.基托过厚
B.基托伸展范围不够
C.颌间距离过低
D.咬合不平衡,下颌天然牙牙合力过大
E.基托塑胶质量差
—______ Your name again, please. —It's Bell Green.
A. I didn't quite catch youB. I couldn't quite catch youC. I don't hear youD. It's your name