PEX geothermal pipe series, characteristics of product: Terrestrial radiation heating is to lay pipeline under the ground indoors, heat the floor to certain temperature by special reversible circulation way of hot body in pipe, radiate heat to the room evenly from the floor, at the same time, under the function of specific gravity difference of the cold and the hot air, the natural air convection creates the tepid climate in the room with ideal temperature distribution, making the indoor environment reach the most comfortable state of human sense organ.
PEX地热管系列，产品特点：地面辐射采暖是在室内的地面下铺设管道，通过管内热体特殊的双向循环方式将地板加热到一定温度，再由地板均匀地向室内辐射热量，同时在冷热空气的比重差作用下，产生了空气的自然对流现象，从而创造出具有理想温度分布的室内热微气候，使室内环境达到人体感官最舒适的状态。
Interaction between a reversible engine (A) and a reversible ideal gas Carnot cycle (B). (Illustration courtesy of OCW. The forming of personality is the results of these two pieces of systematic circulation movement.
可逆热机（）理想气体可逆卡诺循环（）相互作用。（片由开放式课程提供。人格的形成是内外两个系统相互作用、循环运动的结果。
The paper presents the application of the method of restraining circulation in DC reversible speed controlsystem to the AC direct frequency modulation speed control systen.
本文介绍把直流可逆调速系统抑制环流的方法用于交流直接变频调速系统。
The major contents include: the movable type shallow slot pickling machine with continuous turbulent flow; double frames of 1400mm and 12 rollers reversible cold rolling mill, TZQR-200／425 type annealing furnace with strong circulation cover and burning gas; temper mill, shearing machine, the major workshop and supplementary workshops and facilities for public utilizies.
主要包括：推拉式浅槽紊流连续酸洗机组；1400mm双机架12辊可逆冷轧机组；TZQR-200／425型燃气强循环罩式退火炉；平整机组；剪切机组；主附厂房和公辅设施。