A:运行角速度小
B:运行线速度大
C:覆盖范围广
D:向心加速度小
Every student in my brother's class a computer.
⑴Listen to____ A. 进来
⑵Look at____ B. 窗户
⑶rubber____ C. 听……
⑷window____ D. 橡皮
⑸come in____ E. 看…….
计算:2ab+3ab=____ .