北约敦促朝鲜放弃核武器 BRUSSELS, April 23 (Xinhua) -- Foreign ministers from the 28 NATO countries on Tuesday urged the Democratic People's Republic of Korea (DPRK) to abandon all nuclear weapons and existing nuclear and ballistic missile...
数千年来,大气中碳12和碳14的比例是稳定不变的,然而,二十多年以来的原子弹试验,使得碳14的水平增加。生长中的葡萄吸收了空气中的二氧化碳,而通过测试葡萄中的碳含量,就可以大致...
US, Europe Working Together on Iran Nuclear Issues International Atomic Energy Agency chief Mohamed ElBaradei says Iran has concealed sensitive nuclear activities for nearly 20 years, creating what he...