有一个竖直放置的圆形轨道半径为r由左右两部分组成如图3 b 8所示右半部分aeb是光�的左半部分bfa是粗糙的.现在最低点a给一个 Template




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tomski有一个竖直放置的圆形轨道半径为r由左右两部分组成如图3 b 8所示右半部分aeb是光�的左半部分bfa是粗糙的.现在最低点a给一个 coloring