To install the crane span before installation, camber, level of metal structure of main girder bending, trolley rail height difference, gauge deviation, diagonal bridge survey.
安装前要对起重机安装跨度，金属结构主梁的拱度、水平旁弯，小车轨道高低差、轨距偏差，桥架对角线等进行测量。
Objective To survey the pathogenesis, clinical characteristics and surgical management of A-pattern deviation.
目的 探讨A型斜视的病因、临床特征、手术治疗方法及疗效。
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