Reform and result of washing water closed - cycle in coal preparation 選煤廠洗水閉路循環(huán)改造及效果
The close - cycle control thyristor digit triggering circuit design 閉環(huán)控制晶閘管數(shù)字觸發(fā)電路設(shè)計
Mgb2 can be cooled by liquid hydrogen or liquid neon or by fairly cheap , closed - cycle refrigerators that can readily reach below 20 k 硼化鎂可以藉由液態(tài)氫、液態(tài)氖或是相當(dāng)便宜的封閉循環(huán)式冷凍機,輕易降溫至20k以下。