题目

What impressed me most in 2003 was the success of Shenzhou V and China’s becoming the third nation to send a man into space,        _______ all our Chinese are proud. A. of which                              B. for which     C. of that          D. for it 答案：A9．25℃时，向10mL 0.1mol•L-1 H2C2O4溶液中滴加等浓度的NaOH溶液，溶液的pH与NaOH溶液的体积关系如图所示．下列叙述不正确的是（　　）A．C点溶液中含有NaHC2O4和Na2C2O4B．NaHC2O4溶液中水的电离程度比Na2C2O4溶液中小C．B点，c （Na+）=2[c （H2C2O4）+c （HC2O4-）+c （C2O42-）]D．D点，c （Na+）＞c （C2O42-）＞c （OH-）＞c （HC2O4-）＞c （H+）