固定光�细杆与地面成一定倾角在杆上套有一个光�小环小环在沿杆方�的推力f作用下�上运动推力f与小环速度v随时间变化规律如图所示取重力 Template




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tomski固定光�细杆与地面成一定倾角在杆上套有一个光�小环小环在沿杆方�的推力f作用下�上运动推力f与小环速度v随时间变化规律如图所示取重力 coloring