( 10分 ) 有机物A是一种含溴的酯,分子式为C6H9O2Br,已知有如下的转

题型:实验题

问题:

( 10分 ) 有机物A是一种含溴的酯,分子式为C6H9O2Br,已知有如下的转化关系:

其中B、C含相同数目的碳原子,B既能使溴水褪色,又能跟Na2CO3溶液反应放出CO2气体,C依次进行氧化、消去反应后可以转化为B,经测定E是一种二元醇。

( 1 ) 写出结构简式: A _________ 、B __________ 、C __________ 、E _________ 。

( 2 ) 写出A在NaOH溶液中水解的化学方程式: _______________________________

考点:气体的收集、净化、干燥氯气的制取其他物质的制备(硫酸铜晶体、铁红等)乙烯的制取
题型:实验题

The leader of the factory told us that very little ___was made of the waste material in the past.

A.cost

B.value

C.use

D.matter

题型:实验题

公安机关对治安案件的调解,其内容是()。

A.民间纠纷的实体内容

B.违反治安管理的行为及相关损害赔偿

C.有关损害赔偿

题型:实验题

应抄录在临时医嘱栏内的医嘱是()。

A.流质

B.一级护理

C.地西泮5mg,Hs

D.测BP,qd×3天

E.半坐卧位

题型:实验题

I got a job teaching special education at a school in Coachella, California, a desert town about 170 miles from home. It was no (1) job. Street gangs (2) around the school after dark.

"Be careful, " Dad warned me during one of my frequent weekend (3) home. He was concerned about my living (4) , but I needed to be on my own.

One evening, I stayed after school to rearrange my classroom. (5) , I turned out the light and closed the door. Then I (6) toward the gate. It was (7) ! I looked around. Everyone had gone home.

After (8) all the exits, I found just enough (9) to squeeze under a gate in the back of the school. Then I walked toward my car, parked in a field behind the building.Suddenly I heard voices. I (10) around and saw at least eight boys following me. (11) my pace, I reached into my shoulder bag to get my key. I (12) all over the inside of my handbag. But the key wasn’t (13) ! Dear Lord, please help me, I prayed (14) . Suddenly, my fingers touched a loose key in my purse. I didn’t even know if it was for my car, but I took it out and (15) it. It worked!I opened the door, slid in and locked it—just (16) the teenagers surrounded the car. Trembling , I started the engine and (17) away. When I returned to my apartment, the phone was ringing. It was my Dad. I didn’t tell him about my experience; I didn’t want to (18) him. "Oh, I forgot to tell you!" He said, "I had a (n) (19) car key made and slipped it into your purse—just (20) you ever need it.

4()

A.happily 

B.far 

C.nearby 

D.alone

题型:实验题

简述游仙诗渊源及郭璞《游仙诗》

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