本文介绍了半封闭螺杆冷水机组PLC控制系统的组成。

This paper describes the composition of the PLC control system of the semi-hermatic screw water chiller.

中下部高压自源-它源半封闭成藏动力学子系统；

There are: lower half closed dynamics systems with high pressure and self-sources;

本文以老府河为实例探讨了人工控制半封闭河流水环境容量的计算方法。

The thesis research the calculation method of water environmental capacity for artificial controlled semi-close river taking Laofuhe river as an example.

汉民族的祖先最早生活在黄河流域，半封闭的大陆地势，丰沛的水资源，便于农作物的生长。

Han ethnic ancestors living in the Yellow River Basin, semi-enclosed topography of the continent, rich in water resources, facilitate the growth of crops.

文末给出了算例，分析了隧洞的半封闭特性对应力、位移和孔隙水压力的影响。

Examples are presented at the end of this paper to analyze the influence of the partial sealing property of tunnel on stress, displacement and pore pressure.