具体运思期（period of concrete operation）： 4.形式运思期（period of formal operation）： 皮亚杰认为空间认知是一种知识和实体的结构及空间关系之内在或认知的表象。
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Through bearing capacity test and quite a long period of operation, the structure and anchorage measures of concrete crane girder are proved to be reasonable.
通过承载试验成果及一段时间的运行表明，岩壁吊车梁体形及锚固措施设计是合理的。
But in concrete construction to operation of the cooling period by the highest temperature stability temperature, often in concrete caused considerable internal pull stress.
但是在施工中混凝土由最高温度冷却到运转时期的稳定温度，往往在混凝土内部引起相当大的拉应力。
Permanent superficial thermal insulation by foamed plastics is the effective method to prevent cracking in operation period of concrete arch…
表面永久保温是防止运行期出现裂缝的有效方法。
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