This is the problem _____you can help him.
A.with which
B.to which
C.which
D.that
答案:A
骨杠杆的基本形式主要有哪几种?
全口义齿人工牙排列成平衡主要是为了()。
A.提高咀嚼效率
B.增强义齿固位
C.增强义齿稳定
D.有利于美观
E.防止咬舌