director cone of a ruled surface
director cone of a ruled surface
[造纸英汉词典]
director cone of a ruled surfacen.直纹面的准锥面
是什么意思，director cone of a ruled surface的解释，director cone of a ruled surface的翻译
director cone of a ruled surface
[造纸英汉词典]
director cone of a ruled surface是什么意思，director cone of a ruled surface的解释，director cone of a ruled surface的翻译