问题
单项选择题
乳香具下列哪项特征
A．与水共研呈白色乳状液
B．与水共研呈黄棕色乳状液
C．粉末遇硝酸呈绿色
D．用微量升华法收集样品，镜检可见苯甲酸的细小结晶
E．外色黑似铁，研粉红如血，火燃有苯甲酸香气
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
乳香具下列哪项特征
A．与水共研呈白色乳状液
B．与水共研呈黄棕色乳状液
C．粉末遇硝酸呈绿色
D．用微量升华法收集样品，镜检可见苯甲酸的细小结晶
E．外色黑似铁，研粉红如血，火燃有苯甲酸香气
参考答案：A
| 改错题。 | |
| 1. He told us about the countries where he had visited. 2. Egypt is a country where is famous for its pyramids. 3. China is the country which he spent the best part of his life. 4. The days when we spent together cannot be easily forgotten. 5. The house stands at the place that the two roads meet. 6. We shall visit the college where his father teaches there. 7. I know the reason that she looks so worried. 8. He left me the book, that is very useful for me. 9. This is the room which food is kept. 10. April 15, 1976 is the day when we'll never forget. | _________ _________ _________ _________ _________ _________ _________ _________ _________ _________ |
