题目

On the afternoon of September 27,2008 ,astronaut Zhai Zhigang became the first Chinese man to walk in space on Saturday, clambering（攀爬）out of China's Shenzhou VII space craft in a technological feat（成就） that made the Chinese people excited． I'm feeling quite well． I greet the Chinese people and the people of the world, Zhai said as he climbed out of the craft at around 16:40 Beijing time, a historic achievement telecast live on CCTV．Tens of millions of Chinese viewers gathered before TV screens to watch the moment． Chinese President Hu Jintao and other top leaders had 某金属用频率为ν1的光照射时，产生的光电子的最大初动能是用频率为ν2的光照射时产生的光电子的最大初动能的2倍，这种金属的逸出功是W＝________．