橙酮类

题型:名词解释

问题:

橙酮类

考点:中药化学中药化学题库
题型:名词解释

下面四个所给的选项中,哪一选项的盒子能由下边所给定的图形做成()

A.A

B.B

C.C

D.D

题型:名词解释

阅读理解。

     An old man sees some money on the road outside the school gate. He picks it up and waits there all day,

but no one comes to take it back. He says, "I don't have any money, so I'm going to take this."

     A woman hears his words. She says, "Yes, take it and buy some food with it."

     The old man takes the money to a shop. He buys five pens with it. Then he stands at the gate of the

school. He gives the pens to the poor boys and girls. Now he has no money, but he is very happy.

1. The old man  _____.

A. doesn't pick the money up

B. picks the money up

C. takes his money back and goes away

D. waits outside the shop all day

2. The woman says to the old man, " _____. "

A. You can buy some food with the money

B. You must buy some pens with it

C. You cannot take the money

D. We can buy some food with it

3. The old man takes the money  _____.

A. with the woman

B. to the school

C. to a shop

D. home

4. The old man buys some pens and then he  _____.

A. sells all the pens to the boys and girl

B. sells the pens to the woman

C. gives the pens to the poor boys and girls

D. gives all the pens to the woman

5. The old man has no money, but he is very _____.

A. happy

B. strong

C. hungry

D. careful

题型:名词解释

Jim _____ on the computer when his father returned home.

[      ]

A. works

B. worked

C. was working

D. is working

题型:名词解释
在匀强磁场中有一个原来静止的碳14原子核,它放射出的粒子与反冲核的径迹是两个相内切的圆,如图所示.那么碳14的衰变方程为(  )

A.+

B.+

C.+

D.+

题型:名词解释

.欲检验一瓶中装的是稀氨水,现用一沾有浓盐酸的玻棒靠近瓶口,为了使现象明显,可事先往瓶中加入下列哪种物质

①浓H2SO4 ②固体烧碱 ③固体P2O5 ④生石灰 ⑤固体NH4Cl ⑥固体食盐

A.①②     

B.②③④     

C.②④⑤

D.①③⑥

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