曲面体的截交线通常为（）或（），求作相贯线的基本思路为求作两相交回转体表面上一系列共有点。
参考答案：空间曲线；平面曲线和直线
根据所给中文，英文释义及首字母提示完成句子。
1. How many ______ (猴子) does the zoo have?
2. He listens to the teacher as ______ (仔细) as his cousin.
3. The old man lived in a _______ (not quiet) street, so he couldn't sleep well every day.
4. W_______ (the fourth day in a week) is my busiest day.
5. My ideal school starts at 9:00a. m. and f______ at 3:00p.m.
网纹辊主要用于（）印刷。
A.平版
B.凹版
C.柔性版
D.孔版
