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Beijing — Premier Wen Jiabao has urged the leadership of all countries to deepen their political will in dealing with climate change woes (灾难) as uncertainties mount (增长) in the months before the United Nation’s conference in Cancun, Mexico, at the end of this year. Wen made the remarks on Friday when he met with nearly 20 politicians, climate change and environmental ministers worldwide, who are in Beijing this weekend to attend an international forum on green economy and climate change. Based on the achievements made at the Copenhagen Summit last December, Wen urged the rich coun 五种短周期元素的原子半径及主要化合价如下表： 下列叙述正确的是 A． R与M的单质及其化合物有相似的化学性质 B． L、M的单质均用电解其熔融的盐的方法冶炼而得 C． T的氢化物还原性及稳定性均比Q的氢化物强 D． 五种元素的常见简单离子中半径最大的是Q2－