近年来,染发俨然已成为人们的时尚选择。专家称,对苯二胺(化学式为C6H8N2 )

题型:选择题

问题:

近年来,染发俨然已成为人们的时尚选择。专家称,对苯二胺(化学式为C6H8N2 )是染发剂中必须用到的一种着色剂,在加热时,对苯二胺会通过皮肤毛囊进入毛细血管,产生皮肤癌、白血病等多种疾病,是国际公认的一种致癌物质。以下关于对苯二胺的说法不正确的是      [ ]

A .对苯二胺由碳、氢、氮三种元素组成  

B .对苯二胺中碳、氢、氮三种原子个数比为3 :4 :1  

C .对苯二胺完全燃烧后只生成二氧化碳和水  

D .对苯二胺由分子构成

考点:化学式的写法和意义
题型:选择题

用于胫骨骨折的是()。

A.萨尔诺踝足矫形器

B.奥索伦踝足矫形器

C.西蒙斯踝足矫形器

D.斯蒂尔斯踝足矫形器

E.以上都不对

题型:选择题

Rain was falling as my sister Jill and I ran out of the church, eager to get home and play with the   1  that Santa had left for us. Across the street was a gas station where the bus stopped. It was   2  for Christmas, but I noticed a family standing close to the locked door in an attempt to keep   3 .
We were on the way to our grandparents’ house for the Christmas dinner. We were approaching our destination(目的地)   4  my father U-turned in the middle of the road and said, “I can’t   5  it! They are standing in the rain. They’ve got children. It’s Christmas. ”
When my father   6  the gas station, he rolled down his window. “Merry Christmas. You are waiting for the   7 ?” Father asked.
The man said that they were. They were going to Birmingham, where he had a brother and   8  of a job.
“Why don’t you all get in the car and I’ll   9  you up there. ”
After they settled in, Father looked back over his   0  and asked the children if Santa had found them yet. Their sad faces gave him the   11 .
“Well, I didn’t think so,” my father said, “  12  when I saw Santa this morning, he told me that he was having   13  finding all, and he asked me if he could leave your toys in my   14 . We’ll just   15  them first before I take you to your destination. ” All at once, the three children’s faces shone with   16 .
When we got out of the car at our house, the children   17  the front door and straight to the Christmas tree. One of the girls picked up Jill’s doll and   18  hugged it to her breast, and the other girl seized(抓住)something of mine.
All this happened many years ago, but the memory of it remains   19 . That was the Christmas when my sister and I learned the   20  of making others happy.
小题1:
A.balls B.presents C.parcels D.trees
小题2:
A.open B.familiar C.closed D.unexpected
小题3:
A.clean B.energetic C.active D.dry
小题4:
A.while B.when C.now that D.even if
小题5:
A.understandB.admit C.deserve D.stand
小题6:
A.pulled into B.drove away C.passed by D.looked at
小题7:
A.truck B.brother C.bus D.driver
小题8:
A.chances B.benefits C.emergenciesD.discoveries
小题9:
A.show B.seek C.bring D.drive
小题10:
A.window B.head C.shoulder D.children
小题11:
A.sympathy B.answer C.problem D.belief
小题12:
A.because B.though C.as if D.so
小题13:
A.pleasure B.trouble C.confidence D.suffering
小题14:
A.company B.car C.shop D.house
小题15:
A.recognize B.buy C.fetch D.find
小题16:
A.doubt B.disappointment C.curiosity D.excitement
小题17:
A.ran through B.stared at C.watched outD.looked through
小题18:
A.shyly B.immediately C.quietly D.slowly
小题19:
A.sensitive B.worthwhile C.fresh D.weak
小题20:
A.joy B.award C.patience D.attention
题型:选择题

()的分析可以反映城市的性质、经济结构、现代化水平、城市设施社会化程度、社会结构的合理协调程度,是制定城市发展政策与调整规划定额指标的重要依据。

A.劳动力构成

B.产业构成

C.职业构成

D.产业结构与职业构成

题型:选择题

()是确定螺栓连接的装配画法中零件尺寸的两种方法。

A.查表法

B.测算法

C.公式法

D.比例法

题型:选择题

简述乳液聚合生产方法特点。

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