日常生活中的塑料包括很多种,其中PET(聚对苯二甲酸乙二醇酯)塑料被广泛用于生产

题型:填空题

问题:

日常生活中的塑料包括很多种,其中PET(聚对苯二甲酸乙二醇酯)塑料被广泛用于生产包装瓶、电器元件、汽车配件等;PS塑料被广泛应用于光学工业中,PET塑料、PS塑料可按下图所示合成。

(1)C能与含氧酸发生酯化反应,则C的分子式为             ,其所含的官能团的名称为          

(2)X、Y互为同分异构体,分子式为C8H10,则X的结构简式为              

其核磁共振氢谱有           种峰。

(3)D分子中含有一个甲基,则D→E的化学方程式为                       

E与CH2=CH—CH=CH2在一定条件下1︰1发生反应生成除苯环外无支链的高聚物的化学方程式为                                                  

(4)Z是B的同分异构体,其具有如下性质:①遇FeCl3溶液显紫色;②能与NaHCO3溶液反应放出CO2;③苯环上的一氯代物只有三种;④苯环上只有2个取代基相邻。则Z的结构最多有          种,写出其中一种的结构简式          

考点:有机物的推断
题型:填空题

I was shopping in the supermarket when I heard a young voice.“Mom,come here!There's this lady here my size!”

The mother rushed to her son;then she turned to me to say sorry to me.

I smiled and told her,“It's OK.”Then I talked to the boy,“Hi,I'm Dory Kramer. How are you?”

He studied me from head to toe,and asked,“Are you a little mommy?”

“Yes,I have a son,” I answered.

“Why are you so little?”he asked.

“It's the way I was born,” I said.“Some people are little. Some are tall. I'm just not going to grow any bigger.”After I answered his other questions,I shook the boy's hand and left.

My life as a little person is filled with stories like that. I enjoy talking to children and explaining why I look different from their parents.

It takes only one glance( 一瞥) to see I’m different. I stand three feet nine inches tall(="1.14" metres).I was born a dwarf.In spite of this,I did all the things other kids did when I was growing up.

I didn't realize how short I was until I started school. Some kids called me names (辱骂).Then I knew. I began to hate the first day of school each year.

But I learned to smile and face the fact that I was going to be noticed my whole life. What I lacked in height,I made up for in personality. When people are rude,I remind myself,“Look what else I have-a great family,nice friends.”

小题1:Why did the mother say sorry to Dory Kramer?

A.Because the boy ran into the author.

B.Because the boy hit the author.

C.Because the boy said the author was fatter than him.

D.Because the mother thought the boy's words had hurt the author.小题2:What does a dwarf look like?

A.Of medium height.

B.Very tall.

C.Very short.

D.Very thin.小题3:When did the author realize that she was too short?

A.When she grew up.

B.When she was 47 years old.

C.When she began to go to school.

D.When she met the boy in the supermarket.小题4:What does the sentence “What I lacked in height,I made up for in personality”mean?

A.Although I am not tall, I often dress up to make myself different.

B.Although I am not tall, I can make myself tall by dressing up.

C.Although I am not tall, I try to keep it as my personal secrets.

D.Although I am not tall, I can make myself good with good personal qualities.

题型:填空题
已知向量
m
=(
3
sin2x+2,cosx),
n
=(1,2cosx)
,设函数f(x)=
m
n

(1)求f(x)的最小正周期与单调递减区间
(2)在△ABC中,a、b、c分别是角A、B、C的对边,若f(A)=4,b=1,△ABC的面积为
3
2
,求a的值.
题型:填空题

关于子宫内膜癌的临床分期Ⅱ期是指()

A.子宫腔≤8cm

B.子宫腔>8cm

C.癌灶局限于子宫腔内

D.癌灶已侵及子宫颈

E.癌灶已侵及直肠或膀胱

题型:填空题

腰椎牵引诱发疼痛时,应该

A.继续牵引,等待患者逐步适应

B.暂停牵引,查明原因再确定是否继续治疗

C.禁止牵引

D.口服镇痛药物,继续牵引

E.局部注射消炎镇痛药物,继续牵引

题型:填空题

爬行类动物的嗜异性粒细胞与哺乳动物的()类似

A.嗜酸性粒细胞

B.嗜碱性粒细胞

C.肥大细胞

D.嗜中性粒细胞

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