Is the official job of China Construction Fourth Bureau an iron rice bowl?

The school recruit of China Construction Fourth Bureau is a regular worker, belonging to employees who directly sign labor contracts with enterprises, and there is no iron rice bowl. Because this kind of enterprise unit carries out school recruitment, it generally belongs to the establishment, and the welfare he enjoys is the welfare of China Construction Fourth Bureau. He generally enters some key universities, and the student ability and education of the key universities that carry out school recruitment are recognized by everyone. Generally, only regular employees will recruit fresh graduates from campus.