1 前言 几年来,CO_2工业遇到了一个难题。当我们极力吹捧CO_2对扑灭炽热火灾的优点时我们谈到它的低温和致冷能力。当提到由于低温造成危害时,我们认为CO_2没有弄湿表面,而且它也会迅速暖起来。 直到计算机和其他灵敏电子设备变成了很平常的设备后,这些理由才被认为是正确的。在此以前不久人们认识到了CO_2在一定条件下的致冷效应。 1 Introduction In recent years, CO 2 industry has encountered a problem. When we strongly touted the advantages of CO_2 on the fiery fire, we talked about its low temperature and cooling capacity. When it comes to the damage caused by low temperatures, we think CO 2 does not wet the surface, and it warms up quickly. These reasons were not considered correct until computers and other sensitive electronic devices became commonplace devices. Not long ago, people realized the cooling effect of CO 2 under certain conditions.