问题
选择题
You_______that mistake；you were too careless．
A．should not make
B．should not have made
C．ought not have made
D．must not have made
答案
B
搜题请搜索小程序“爱下问搜题”
You_______that mistake；you were too careless．
A．should not make
B．should not have made
C．ought not have made
D．must not have made
B
、
，小球能达到的最大高度为
。若运动过程中小球所受的空气阻力大小不变，小球上升到离水平面的高度为
时，小球的速度和动能分别为
、
，则
