单项选择题 气体反应 CO + H2O ＝CO2 + H2 ，此反应的△rGm和与体系总压的关系是
单项选择题 下列贵金属元素中,发现时间最晚的是哪一个? A. 银 B. 金 C. 钯 D. 铂 E. 铑 F. 铱 G. 钌
单项选择题 In the growth of present day English vocabulary, there are three main sources of new words, the rapid development of modern science and technology, social, economic and political changes and the influence of_______. A. the educational system B. other cultures and languages C. the government system D. the society changes