如图所示为竖直面内的光�半圆弧轨道o为圆心ab是位于同一水平线的圆弧上的两点c为圆弧最低点ac间有一光�直杆oa与竖直方�的夹角为 Template




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tomski如图所示为竖直面内的光�半圆弧轨道o为圆心ab是位于同一水平线的圆弧上的两点c为圆弧最低点ac间有一光�直杆oa与竖直方�的夹角为 coloring