小虎同学利用注射器（容积为V）、弹簧测力计和刻度尺估测大气压的值．
A: Hello, Kate. ____
B: That's beautiful. I like it.
A: ____
B: I need four.
B: They're funny.
A: You can also buy a T-shirt for your friend.
B: ____
A. Good idea.
B. What about these caps?
C. Come and look at this cap.
D. How many caps do you need?
E. Let's go.
下列多项式乘法中可以用平方差公式计算的是（ ）
1928年底，一位热血青年在井冈山入伍参军，当时他参加的军队应是( )
