第五类:非主业但所属企业从事有少量建筑业务的央企。共计28家,详见表5。综上,在国资委管理的117家中央企业中,从事有建筑业务的有67家,占57.3%,其中以建筑业为主业的有21家,占17.9%,详见表6。为便于表述,本文将从事有建筑业务的中央企业(含二三 Fifth category: non-main business but affiliated enterprises engaged in a small amount of construction business central enterprises. A total of 28, as shown in Table 5. To sum up, of the 117 central SOEs administered by SASAC, 67 are engaged in construction business, accounting for 57.3%, of which 21 are mainly construction (accounting for 17.9%), as shown in Table 6. In order to facilitate the presentation, this article will engage in the construction of the central business enterprises (including two three