大连接体不具备的作用是（）。
A.连接局部义齿各部分
B.支持和稳定作用
C.传导和分散力
D.固位作用
E.增加义齿强度
参考答案：D
用括号内所给动词的适当形式填空。
1. My father _____ (not listen) to the radio at the moment.
2. Tom _____ (write) a letter to his friend these days.
3. —What's your brother doing?
—He _____ (clean) his new car.
4. Let's _____ (shop) for the coming New Year.
5. What can you _____ (see) in the picture?
在没有括号的算式里，如果只有______法或者只有______法，都要从左往右按顺序计算．
