问题
单项选择题
取某药材乙醇提取液，点在滤纸上，干后，置紫外光灯下观察，显天蓝色荧光。于点样处加稀盐酸1滴，干后显黄绿色荧光，用氨试液熏后复显天蓝色荧光。该药材是
A．苏木
B．降香
C．关木通
D．钩藤
E．川木通
答案
参考答案：C
搜题请搜索小程序“爱下问搜题”
取某药材乙醇提取液，点在滤纸上，干后，置紫外光灯下观察，显天蓝色荧光。于点样处加稀盐酸1滴，干后显黄绿色荧光，用氨试液熏后复显天蓝色荧光。该药材是
A．苏木
B．降香
C．关木通
D．钩藤
E．川木通
参考答案：C
| 单词填空。 1. The _____ (重要性) of English will last. 2. Do you think your _____ (口语) English has reached Level Five? 3. Everyone who uses English _____ (拥有) English. 4. Fifteen minutes is a _____ (一刻钟) of an hour. 5. As we know, Singapore is famous for its _____ (旅游) in the world. 6. More and more _____ (工业) products have been sold all over the world since China joined WT  O.7. Chinese will be in _____ (代替) of English to be the most popular language in the world. 8. We should practice speaking _____ (日常的) English with our classmates. 9. English is _____ (极其重要的) for international business and Internet because it's used so widely. 10. This is a _____ (近来的) period in history. |