什么叫“一脱三注”？
参考答案：
“一脱三注”是指对原油进行脱盐、蒸馏中注中和剂、注水、注缓蚀剂的一种工艺防腐方法。
情景交际。
A. That's great.
B. I often go shopping.
C. I know.
D. I often surf the Intemet.
E. What's your QQ number?
F. Do you have a QQ number?
G. How often do you surf the Intemet?
A: What do you do on weekends? .
B: 1.______
A: Shopping?
B: Yes, what about you?
A: 2.______
B: 3. ______
A: Twice a week.lt's pretty nice.
B: What do you do on the Internet?
A: I usually talk with my friends. 4.______
B: Yes. It's 356478201.
A: 5.______ We can talk on the Internet.
把圆等分成若干个小扇形，这些小扇形不可能拼成（ ）
A．长方形
B．正方形
C．平行四边形
D．梯形
