中文摘要：

良B-拟-Ehresmann半群是幂等元子带B满足一些条件的半群，其中B被称为投射带。纯整半群、型形半群、纯整超rpp半群和投射纯整幺半群都是良B-拟-Ehresmann半群。本文刻画了投射带是左半正则带的良B-拟-Ehresmann半群。

英文摘要：

A good B-quasi-Ehresmann semigroup is a semigroup which has a subband B satisfying some additional conditions, in which B is called the band of projection. Orthodox semigroups, type W semigroups, orthodox supper rpp semigroups and projective orthomonoids are all good B-quasi-Ehresmann semigroups, In this paper, the characterizations of good B-quasi-Ehresmann semigroups with left semiregular bands of projections are exhibited.