不属于干粉喷嘴主要形式的是（）。
A、直流喷嘴
B、扩散喷嘴
C、雾化喷嘴
D、扇形喷嘴
参考答案：C
用适当的介词填空。如不需填则画“／” 。
1. Can you come to my party _______ Sunday afternoon?
2. Would you like to go to the movies with us _______ Friday?
3. They gets up early _______ the morning.
4. He does exercise ________ every morning.
5. Are you free _______ tomorrow morning?
以下不属于开辟牙列间隙的是（）
A.邻面去釉
B.拔牙
C.舌倾牙的纠正
D.唇倾牙的纠正
