短語(yǔ)詞組短語(yǔ)nil commutative ring 詣零交換環(huán)near nil semisimple ring 近似詣零半單環(huán)generalized nil radical of ring 環(huán)的廣義詣零根nil radical of near -ring 擬環(huán)的詣零根 返回 nil ring