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# num! error: empty intersecting area
#num!
最后更新: 2011-10-23
使用频率: 2
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two perpendicular axes can be used, intersecting at the focus, to allow the paraboloid to follow both the sun's daily motion and its seasonal one.
two perpendicular axes can be used, intersecting at the focus, to allow the paraboloid to follow both the sun's daily motion and its seasonal one.
最后更新: 2016-03-03
使用频率: 1
质量: