The compulsory inspection shall be subject to separate bidding, and the bidding documents generally state that the consortium is not allowed to bid.
Compulsory verification refers to the working measuring instruments listed in the national compulsory verification catalogue in four aspects: trade settlement, safety protection, medical and health care and environmental monitoring. It is the highest measurement standard used by social public measurement standards, departments, enterprises and institutions, and is carried out by legal measurement verification institutions or measurement verification institutions authorized by government measurement administrative departments, and is subject to fixed-point and regular verification.