问题
选择题
Tony, mind your manners! Don’t _______ while others are talking.
A．cut in
B．cut off
C．cut down
D．cut up
答案
答案：A
搜题请搜索小程序“爱下问搜题”
Tony, mind your manners! Don’t _______ while others are talking.
A．cut in
B．cut off
C．cut down
D．cut up
答案：A
，为了使两车不可能发生碰撞，当两车相距适当距离时，人从甲车跳上乙车，试求人跳离甲车的水平速度(相对地面)应满足什么条件？不计地面和斜坡的摩擦，小车和人均可看作质点．