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JINTAN,JTANGSU:The 20 students 18 boys and 2 girls — had a thousand reasons to be proud of themselves. They had just climbed their way to the top rung(阶梯) out of 4 million students taking part in the Fifth National Hua Luogeng Gold Cup Mathematics Contest (竞赛)Tuesday evening. The 20 gold medal winners are all primary and middle school students under the age of 14. ‘Many of the problems are of college level and these pupils can figure them out. It is just unbelievable! ‘said a teacher from Guangdong province. Named after China’ s most famous mathematician, Hua Luogeng, the contest started in 1986, one year after his death. In less than 10 years, it has been recognized by the State Education Commission (国家)as the country’s biggest and best contest of its kind. 1. This news story is mainly about . A. when the contest started B. how the contest got its name C. the 20 pupils who have won gold medals in the contest D. the 5th National Hua Luogeng Gold Cup Mathematics Contest 2. This news story most probably appeared in a news paper in . A.1995  B. 1987  C. 1986  D. 1997 3 Ii can be inferred from the text that the teacher from Guangdong province . A. felt proud of the gold medal winners B. wondered if the students were honest C. thought that the problems were too difficult for the  students D. believed that the twenty winners could go to study at university 4 The underlined phrase ‘figure out’ in the text means . A .guess  B. add up  C. work out  D. study
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【单选题】磷酸的 p K a1 、 p K a2 、 p K a3 分别为 2.12 、 7.20 、 12.36 ,在 pH=11.0 的溶液中,磷酸的主要存在形体为 ( )
A.
磷酸根
B.
磷酸一氢根
C.
磷酸二氢根
D.
磷酸分子
【单选题】磷酸的 p K a1 、p K a2 、 p K a3 分别为2.12、7.20、12.36,在 pH=1.0 的磷酸溶液中,磷酸的主要存在形体为:
A.
磷酸根
B.
磷酸一氢根
C.
磷酸二氢根
D.
磷酸分子
【判断题】平衡常数是正反应和逆反应处于平衡时的常数。正反应和逆反应的平衡常数相等
A.
正确
B.
错误
【单选题】647年,唐朝使团在天竺遇袭,正使()杀出重围,向吐蕃松赞干布求援,借1200吐蕃兵和7000泥婆罗军荡平天竺,擒获国王阿罗那顺
A.
李靖
B.
车奉朝
C.
王玄策
D.
唐玄奘
【单选题】当一个化学反应处于平衡时,下列说法不正确的是
A.
反应的标准吉布斯能变为 0
B.
正反应和逆反应速率相等
C.
反应混合物的组成宏观上不随时间而改变
D.
反应商与标准平衡常数相等
【判断题】平衡常数是正反应和逆反应处于平衡时的常数。正反应和逆反应的平衡常数相等
A.
正确
B.
错误
【单选题】磷酸的 p K a1 、 p K a2 、 p K a3 分别为 2.12 、 7.20 、 12.36 ,在 pH=10.0 的磷酸溶液中,磷酸的主要存在形体为( )
A.
磷酸根
B.
磷酸一氢根
C.
磷酸二氢根
D.
磷酸分子
【判断题】单纯性疱疹病毒脑炎首选无环鸟苷抗病毒治疗。()
A.
正确
B.
错误
【简答题】平衡常数是正反应和逆反应处于平衡时的常数,因此不管正反应还是逆反应其平衡常数是相同的。
【单选题】磷酸的 p K a1 、 p K a2 、 p K a3 分别为 2.12 、 7.20 、 12.36 ,在 pH=5.0 的磷酸溶液中,磷酸的主要存在形式为( )
A.
磷酸根
B.
磷酸分子
C.
磷酸二氢根
D.
磷酸一氢根
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