A:too much, too much
B:too many, too many
C:too much, too many
D:too many, too much
一个物体,在5s的时间内通过了20m的位移,则它的平均速度是( )
注音:
篁____ 佩____ 洌____坻____ 屿____ 佁____
翕____ 邃____ 寥____ 俶____ 怆____ 嵁____