conical hniav

Spherical cov hniav feem ntau yog siv los ua cov hniav rau hauv qhov chaw xyaum thiab tsim nyog rau cov pob zeb tawv thiab tawv heev.

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Yav dhau los: Parabolic spherical hniav

Tom ntej: hemi-spherical kawg duab ntxig

Sau koj cov lus ntawm no thiab xa tuaj rau peb