4、支撑结构的安装误差要求，升降过程中的不均匀偏差要求，空间位置的偏差

4, the mounting error of the support structure of claim nonuniform variation in the lifting process requirements, the spatial variation of the position requirements, if required to be symmetrical trusses, parallel;

4, the installation error requirements of the support structure, uneven deviation requirements in the process of lifting, deviation requirements of spatial position, whether truss must be called, parallel;

4. Whether the truss is required to be symmetrical and parallel in terms of the installation error requirements of the supporting structure, the uneven deviation requirements in the lifting process and the deviation requirements of the space position;