With the increasing applications of large span, high-rising or thin-walled concrete structures at present, temperature action often calls reletively high stresses.
阐述了混凝土的收缩作用和温度作用，并提出了在工程实践中进行裂缝控制的措施。
Most large-span space structure by using light or transparent materials covered, in order to achieve some results also build ceiling, It will cause rapid temperature rise.
大跨度空间结构如采用的是轻质或透明的覆盖材料，或设有吊顶，在太阳强烈辐射情况下会使结构温度升高很快。
Large span multi-level synthetic engine oil, has excellent high temperature wear resistance and smooth flow of low-temperature startup performance, enhance engine power.
超大跨度多级合成发动机油，具有卓越的高温抗磨性能和顺滑流畅的低温启动性能，提升发动机动力。
Large span multi-level synthetic engine oil, has excellent high temperature wear resistance and smooth flow of low-temperature startup performance, enhance engine power.
超大跨度多级合成发动机油，具有卓越的高温抗磨性能和顺滑流畅的低温启动性能，提升发动机动力。
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