介绍了自行设计的双级热泵实验系统，分析了实验中遇到的问题，提出了改进方案。
Presents the two-stage heat pump test-bed designed by the authors, analyses the problem existed in experiment and offers the improving method.
该文介绍了一种新型的数字式液压操纵系统，系统采用并联方案，以高速电磁阀为先导控制级，通过双节流阀进行操纵系统的压力、流量控制。
It is a parallel connection system and this system USES the high-speed valve as a pilot valve to control the twin throttle which controls the pressure and the flux of the hydraulic control system.
确定了万吨级生产装置适宜的设计及操作参数，并对反应器上段催化剂稀释与不稀释，以及双段熔盐循环的方案进行了比较。
Options for diluting catalyst in the upper section of the reactor with or without inerts or using dual-salt recycling system are carried out.
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