如图所示一光�的半圆形轨道处于竖直平面内并和一粗糙的斜面相接其半径大小为r=04m直径bc在竖直方�上一小物体放在斜面上的a点离 Template




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tomski如图所示一光�的半圆形轨道处于竖直平面内并和一粗糙的斜面相接其半径大小为r=04m直径bc在竖直方�上一小物体放在斜面上的a点离 coloring