延伸卡环一般用于()
A.近基牙松动,但又可保留的前磨牙
B.孤立前磨牙
C.最后孤立倾斜的磨牙
D.健康正常的基牙
E.游离缺失的基牙
参考答案:A
—Millie, could you give me some advice? I don't know _____.
—Why don't you wear this red shirt? [ ]
A. when to wear
B. what to wear
C. how to wear
D. where to wear
铁口椭圆形砖套是由()块异型砖砌筑而成的。
A.4
B.6
C.8