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полный телесный угол
stresses
math.
立体角非标准单位
;
完全立体角
;
全立体角
;
完全立体角立体周角
tech.
立体周角
;
立体角非标准单位
(为 4 π 立体弧度(5Г) =12.56637 立体弧度)
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