针对我国冷库多、贮藏量大，但超低温冷库很少这一现状，介绍了在原有冷库的基础上，利用复叠式制冷方法将原有的部分冷库加装改造成超低温冷库，从而达到降低成本和节能的目的。
Some methods are introduced to rebuild the normal cold storages into super-low temperature cold storages for full use of cascade refrigeration cycle with low production costs and energy expenditure.
针对叠瓦式构造底板的特殊结构形式，在分析受力情况的基础上，提出了应用于该结构形式底板的抗滑稳定计算公式；
Based on analysed of pressure which act on imbricate structure soleplate, we educed the static force anti-sliding stability formula;
一种折叠式双侧翻转厢盖装置，其上盖板和侧盖板活动连接成一折叠式厢 盖；
The utility model relates to a foldable double-side overturning car canopy device, an upper cover board and side cover boards are movably connected to form a foldable car canopy;
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