问题
单项选择题
下列基准物质可作为上述哪种标准滴定液的标定：对氨基苯磺酸（）
A．硫酸铈滴定液
B．亚硝酸钠滴定液
C．高氯酸滴定液
D．硫代硫酸钠滴定液
E．硝酸银滴定法
答案
参考答案：B
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下列基准物质可作为上述哪种标准滴定液的标定：对氨基苯磺酸（）
A．硫酸铈滴定液
B．亚硝酸钠滴定液
C．高氯酸滴定液
D．硫代硫酸钠滴定液
E．硝酸银滴定法
参考答案：B
| 阅读理解。 |
| American children like K Day very much. March 7th is the day. K is short for kites. On that day, many children go out to play with their friends or parents. They take their kites with them and fly kites in the open air. Some kites are very big, and some kites are small. They're in different colors. Some are red, and some are black. But every kite has a long string. |
| 1. The children ______ like K Day a lot. |
[ ] |
| A. in Canada B. in America C. in UK D. in Japan |
| 2. K Day is in ______. |
[ ] |
| A. spring B. summer C. autumn D. winter |
| 3. On K Day, American children can ______ kites in the open air. |
[ ] |
| A. buy B. make C. fly D. take |
| 4. The kites aren't in the ______ color. |
[ ] |
| A. red B. black C. same D. different |
| 5. Every kite has ______. |
[ ] |
| A. a short string B. a long string C. a red string D. a white string |