What does it mean to open a safety officer B certificate?

Safety officer B certificate refers to the person in charge of construction project management who has obtained the qualification of registered construction engineer and is authorized by an enterprise as a legal person, that is, the construction engineer cooperates with B examination. At present, many construction companies almost require B certificate for recruitment, which shows its importance. Open-book examination is an examination method, but generally closed-book examination is adopted, and there are few open-book examinations.