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。
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.
传统的前向拱丝越来越难以满足目前封装的高密度要求，反向拱丝能满足非常低的弧高的要求。
Traditional forward looping technology is becoming hard to meet high-density requirements of IC Packaging, and reverse looping can comparatively achieve very low loop height.
松滋方言的轻声音节只有音高特征，但轻声前字曲拱特征仍然保留着；
The unstressed syllable in Songzi dialect has only the pitch characteristic, but there remains the arch characteristic of the word previous to the unstressed sound.
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