我院从1965年西安三千吨冷库设计起,开展制冷系统自控设计,当时用于自控的机器设备和仪表,因国内没有产品,全部依靠进口。双级机是丹麦的,单级机是瑞士的,电动阀是西德的,电磁阀是丹麦的,冲霜时间继电器是英国的……。由于择优选用各个国家最好的产品,我院设计人员又花费了 Our hospital from 1965 Xi’an 3000 tons of cold storage design, to carry out refrigeration system design, was used for automatic control of machinery and equipment and instruments, because there is no domestic product, all rely on imports. Two-stage machine is Denmark, the single-stage machine is Switzerland, the electric valve is West Germany, the solenoid valve is Danish, red cream time relay is the UK ... .... As the preferred choice of the best products in various countries, our hospital designers have spent