COMabbr.计算机输出缩微胶片(=computer-output microfilm)abbr.组件对象模型(=Component Object Model)comites[医] 伴血管, 并行血管

1. The minimal ideal of a commutative semigroup, when it exists, is a group.
   交换半群的极小理想如果存在的话是个群。