How Things Work

How Things Work How Things Work A wheel and a lever are simple machines. A pulley and a ramp are simple machines. Machines can be different. Machines can help us go places. Machines can help us do work. Parts make a bicycle move.

Aug 18, 2021 - 12:51
0 321

登录后可以听外教原声朗读。

How Things Work



How Things Work

A wheel and a lever are simple machines.

A pulley and a ramp are simple machines.

......
未登录用户只显示文件一半，登录后可以查看全文，并且可以听外教原声朗读。

Tags: