论文部分内容阅读
本世纪三十年代,重介选做为一种新工艺在西德出现。当时,重介选只用于选民用燃料,四十年代以后,才用于分选肥
In the thirties of this century, HMV appeared as a new technology in West Germany. At that time, HMEs were only used for voter fuel and were used for sorting fat only after the 1940s