High electricity bills point to a poor heating system or bad insulation.高额电费开支说明供暖系统不足或建筑隔热材料不良。They lived in happy insulation from brutal facts.他们幸福地生活在不受残酷现实干扰的世界里。A wet suit provides excellent insulation.湿式潜水服有极佳的隔热性能...
The selectivity of extractant is high and only Au, Pd , Hg ete. are extracted.该萃取剂选择性高,它仅萃取Au 、 Pd和Hg等几种元素.An extractant - screening method with a vapor - liquid equilibrium apparatus in the extractive distillation was i...