A number of companies have now made the high - temperature superconductors into tapes a few millimetres across.液氮是一种便宜而易得的商品,沸点是77K,我们利用它可以在实际应用中比较容易地冷却超导体.We may also look forward to the application of superconductors i...
从前有个 烧炭 人, 独自一人生活和工作.There was once a Charcoal - Burner , who lived and worked by himself.从那以后, 烧炭工人离下岗就不远了.From that point onward, the charcoal - burners'days were numbered.冯先生在三月曾试过烧炭自杀.Fung had tried to commIt�...