（）形螺纹同梯形螺纹的车削方法相似，所要注意的是锯齿形螺纹车刀的刀尖角不对称，刃磨时不能磨反。
A.矩
B.三角
C.锯齿
D.方
参考答案：C
补全句子。
1. You have to g _____ up at six in the morning.
2. My cousin can't s_____ soap operas.
3. He is medium height with curly and b______ hair.
4. He works in a TV station. He is a r_______.
5. The hotel is n_____ to the bank.
若z∈C，且|z＋2－2i|＝1，则|z－2－2i|的最小值与最大值分别是( )
A．2 ，3
B．3 ,5
C．4 ,6
D．4，5
