下列哪项不是牙合支托的作用
A．支持作用B．传递牙合力C．直接固位作用D．恢复抬关系和防止食物嵌塞E．间接固位作用
参考答案：C
—You know, Bob is a little slow____ understanding, so...
— So, I have to be patient ____ him. [ ]
A. in; with
B. on; with
C. in; to
D. at; for
土工膜
