The half - life of francium is 22 minutes.钫的半衰期是22分钟.Francium is the densest of the Alkali Metals and also radioactive.钫是碱金属中密度最大的,具有放射性.Even Francium's most stable isotope, Francium - 223 only has a half - life of ...
In recent times the Faraday effect has been put to even more exciting and promising uses.目前,法拉第效应还有更令人鼓舞的,有前途的应用.That electrically charged particles reside within atoms had been surmised since the time of Faraday.从法拉第的时代...
The roads are built to accommodate gradual temperature changes.修建这些道路时考虑到了温度的逐渐变化。Weaning should be a gradual process.断奶要一步步来。a gradual change in the climate气候的逐渐变化...