Taking the tooth shape chain board as the study object, its main parameters were measured.
系统以齿形链板为研究对象，对其主要参数进行测量。
This thesis takes the architectural steel structure industry as its object of study.
本文以我国建筑钢结构行业为研究对象。
This thesis takes the architectural steel structure industry as its object of study.
本文以我国建筑钢结构行业为研究对象。
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