菠萝酯是一种食用香料,是化合物甲与苯氧乙酸发生酯化反应的产物。 (1)甲一定含有

题型:问答题

问题:

菠萝酯是一种食用香料,是化合物甲与苯氧乙酸发生酯化反应的产物。

(1)甲一定含有的官能团的名称是       

(2)5.8 g甲完全燃烧产生0.3 mol CO2和0.3 mol H2O,甲蒸气对氢气的相对密度是29,甲分子中不含甲基,且为链状结构,其结构简式是       

(3)苯氧乙酸有多种酯类的同分异构体,写出其中能与FeCl3溶液发生显色反应,且苯环上只有两种一硝基取代物的所有可能的同分异构体的结构简式:                                                                       

                                                                       

(4)已知:

菠萝酯的合成路线如下:

①试剂X不能选用的是(选填字母)       

a.CH3COONa溶液    b.NaOH溶液

c.NaHCO3溶液  d.Na

②丙的结构简式是       ,反应Ⅱ的反应类型是                      

③反应Ⅳ的化学方程式是                                            

考点:酯化反应
题型:问答题

— _______________ this?

— It's a pizza. [ ]

A. What's

B. Do you like

C. How many

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阅读理解

     Even before my father left us,my mother had to go back to work to support our family.Once

I came out of the kitchen,complaining,"Mom,I can't peel potatoes.I have only one

hand."

     Mom never looked up from sewing."You get yourself into that kitchen and peel those

potatoes," she told me."And don't ever use that as an excuse for anything again!"

In the second grade,our teacher lined up my class on the playground and had each of us race

across the monkey bars,swinging from one high steel rod to the next.When it was my turn,

     I shook my head.Some kids behind me laughed,and I went home crying.

That night I told Mom about it.She hugged me,and I saw her "we'll see about that"

look.The next afternoon,she took me back to school.At the deserted playground,Mom

looked carefully at the bars.

    "Now,pull up with your right arm," she advised.She stood by as I struggled to lift myself

with my right hand until I could hook the bar with my other elbow.Day after day we

practiced,and she praised me for every rung I reached.I'll never forget the next time,

crossing the rungs,I looked down at the kids who were standing with their mouths open.

One night,after a dance at my new junior high,I lay in bed sobbing.I could hear Mom come

into my room."Mom," I said,weeping,"none of the boys would dance with me."

     For a long time,I didn't hear anything.Then she said,"Oh,honey,someday you'll be

beating those boys off with a bat." Her voice was faint and cracking.I peeked out from my

covers to see tears running down her cheeks.Then I knew how much she suffered on my

behalf.She had never let me see her tears.

1. Which of the following expressions can be used most suitably to describe Mom's attitude

when she made the child peel potatoes?

A. Cruel.  

B. Serious.  

C. Strict.  

D. Cold.

2. From the passage,we know monkey bars can help a child train________.

A. the skill to throw and catch things

B. the speed of one's hand movement

C. the strength and skill to hang and sway

D. the bodily skill to rotate round a bar

3. What does the sentence "I saw her 'we'll see about that' look" imply?

A. Mom believed every aim could be achieved if you stuck to it.

B. The race across monkey bars was not difficult enough for a child to give up.

C. Mom was determined to prove she herself was better than the teacher.

D. What the child had said brought Mom great attraction and curiosity.

4. When the child looked down at the kids,they were standing with their mouths open

because_____

A. they felt sorry for what they had done before

B. they were afraid the author might fall off and get hurt

C. they wanted to see what the author would do on the bars

D. they were astonished to find the author's progress

5. The most probable conclusion we can draw after reading the passage is________.

A. the last incident was sad enough to make Mom weep

B. the child's experience reminded Mom of that of her own

C. Mom could solve any problem except the one in the last paragraph

D. in fact Mom suffered more in the process of the child's growth

题型:问答题

氯化镁

题型:问答题

关于Ober’s试验,下列说法哪项正确()

A.要求患者取患侧卧位

B.正常时患肢应落于健肢的前侧

C.检测髂胫束挛缩和臀中肌无力

D.检测臀中肌挛缩

E.检测髂胫束挛缩或阔筋膜张肌挛缩

题型:问答题

对一审判决不服的上诉期限是()日,对一审裁决不服的上诉期限是()日

A.5,10

B.10,5

C.10,15

D.15,10

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