常見例句DeMorgan's law [計(jì)] 德摩根定律DeMorgan's theorem [計(jì)] 真根定理, 反演定理, 德摩根定理complete DeMorgan algebra 完備DeMorgan代數(shù)completed DeMorgan algebra 完備DeMorgan代數(shù) 返回 DeMorgan