简答:糖尿病是“富贵病”,请你设计实验检验病人尿液中的葡萄糖,并与正常人作对比,设计要求:
(1)写出实验所用化学药品
(2)写出实验现象并作出结论.
解:(1)取少量尿样加入新制的氢氧化铜悬浊液,加热后,若产生红色沉淀,说明尿液中有葡萄糖.
答:实验所用化学药品为新制氢氧化铜(银氨溶液);
(2)取少量尿样加入新制的氢氧化铜悬浊液,加热时出现砖红色沉淀,正常人尿液无现象,证明糖尿病人尿液中含有葡萄糖.
答:现象和结论为加热有红色沉淀产生(有银镜产生),证明含有醛基.
I
⑴What's that in English? ____
⑵What color is the pen? ____
⑶How are you? ____
⑷Who's the girl? ____
⑸He's my brother, Jack. ____
⑹Is he your friend? ____
⑺Good evening, Bob! ____
⑻Where's your key? ____
⑼Are these Dale's cards? ____
⑽Have a good day! ____
II
A.Yes, they are.
B.I'm fine, thanks
C.On the book.
D.It's a ruler.
E.Good evening!
F.She is Kate.
G.No, he isn't.
H.It's black.
I.You, too.
J.Oh, I see.
如图所示,考古人员需要对一口占井进行清理,为了解决照明问题,请你帮他们把太阳光反射到井里,并能垂直照亮井底。