Orthoptic (geometry)
（重定向自Isoptic）
In the geometry of curves, an orthoptic is the set of points for which two tangents of a given curve meet at a right angle.
The orthoptic of
Remark: In medicine there exists the term orthoptic, too.
Isoptic
英语百科
- hydrocarbon mineral oils的意思
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- hydrocarbon mixtures, liquid的意思
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