On the subject of North Korea, ElBaradei said there are two key issues: "One is its obsession with security and the possibility of regime change by the U.S.

VOA: standard.2009.11.04

What is the energy change going from two atomic hydrogens to one H2?

什么是能量的改变,从两个原子氢到H2分子？

麻省理工公开课 - 固态化学导论课程节选

What is the energy change going from two atomic hydrogens to one H2?

什么是能量的改变,从两个原子氢到H2分子？

麻省理工公开课 - 固态化学导论课程节选