减小牙槽嵴力负担的措施中,不可取的是()
A.运用塑料牙
B.减少人工牙数目
C.适当降低咬合接触
D.减小人工牙颊舌径
E.扩大基托面积
参考答案:C
There were already four people sitting in the car, but we tried to make a room for her.
哈理·马柯威茨的《证券组合选择》发表于( )年。
A.1949 B.1952 C.1953 D.1955