1) closed section
封闭截面
1.
According to the theory of thin-walled bar with closed section,a combined mod-el is esta blished of coupling deformation,and an accurate method of analysing stresses between lay-ers is suggested.
用封闭截面薄壁杆理论建立的夹芯杆耦合变形的组合模型得到了芯层应力和层间结合应力的精确化分析方法，并给出了箱形截面杆的分析结果。
2) thin walled elliptical bar
封闭截面薄壁杆
3) closed thin_wall cross_section
封闭薄壁截面
4) ground surface blockage
地面封闭
1.
In this thesis,the concept of ground surface blockage on the problems of city water environment in the world is firstly defined and the harmfulness of ground surface blockage is expounded.
针对全球出现的城市水环境问题，本文提出了地面封闭的概念，阐述了地面封闭的危害，认为地面封闭减少和阻止了大气降水对地表水和地下水的补给，破坏了区域性的水循环，是形成一些城市水环境问题的重要原因之一。
5) closed surface
封闭曲面
1.
The rational symmetry of closed surfaces of the curved surfaces of d chitals on their expasion axes has been studied in the article.
本文讨论了ｄ轨道常见曲面的各瓣封闭曲面绕其伸展轴的旋转对称性。
6) surface sealing
表面封闭
1.
Study on the improvement of wear resistance of the enamel with etching by surface sealing during orthodontic treatment;
表面封闭法提高正畸酸蚀牙面抗磨耗性能的实验研究
补充资料：“自由市场”和封闭性的市场
自由市场亦称为开放性市场，是指商品的生产、销售或购买的集中程度不高，其变动主要受市场的自发力量即价值规律的作用支配，商品价格是在相对自由竞争的条件下形成的，但仍在程度不同的受到垄断的影响。
封闭市场是垄断控制型市场，在这种市场上，垄断者竭力限制竞争和供求自发的波动，使商品供求和价格按照自己希望的方向发展变化，获取高额利润。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条