Reform and result of washing water closed - cycle in coal preparation 选煤厂洗水闭路循环改造及效果
The close - cycle control thyristor digit triggering circuit design 闭环控制晶闸管数字触发电路设计
Mgb2 can be cooled by liquid hydrogen or liquid neon or by fairly cheap , closed - cycle refrigerators that can readily reach below 20 k 硼化镁可以藉由液态氢、液态氖或是相当便宜的封闭循环式冷冻机,轻易降温至20k以下。