延伸卡环适用于（）
A.孤立牙
B.远中孤立的磨牙
C.相邻两牙间有间隙者
D.松动或牙冠外形差的基牙
E.倾斜基牙
参考答案：D
用所给词的适当形式填空。
1.— I'd like to help (kid) with their schoolwork.
—You could volunteer in an after-school study program.
2.When I got home,my pet dog (lie) on the floor,dead.
3.Look! The teenagers are making cards ( show) love for their mothers.
无规则网络学说中各种氧化物在玻璃中的作用是什么？
