近期以来,各地正在开展预制混凝土板类构件包括空心板和大型屋面板的生产许可证的检查,合格的经颁给生产许可证后方可继续生产;不合格的将被禁止生产。这项工作对提高板类构件的生产质量,起了促进作用;对构件厂的企业管理也有所加强。北京市的质量监督部门 In recent years, inspections of production licenses for precast concrete slab components including hollow slabs and large roof slabs have been in progress throughout the country. Qualified production licenses have been issued to allow production to continue; substandard production will be banned. This work has played a catalytic role in improving the production quality of board components, and has also strengthened corporate management of component plants. Beijing Quality Supervision Department