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【简答题】
Maybe you know about Sun Ying on TV. She is a 1 young woman. She was born in Jilin Province. In January 2006, she left her hometown 2 Shenzhen. She found a job in a factory and began to work there. 3 after working for seven months, she went to a mountain shool in Guizhou Province for 4 because she wanted to help the students there. She found that the school had 5 but the old houses without doors. She felt quite 6 . When she got there, she got a warm 7 . The students called her “ Aunt ” and the parents 8 food to her. All the people 1 her. She planned to work there all her life. She wanted to bring 10 to the kids there.
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【单选题】柴油机的压缩比一般 汽油机的压缩比。
A.
大于
B.
等于
C.
小于
【判断题】PP和PVC都是碳链高分子。
A.
正确
B.
错误
【单选题】唐代著名文人王维在长安附近的蓝田一带 依附于庄园而建的一处庄园式私家园林称为?
A.
履道坊
B.
辋川别业
C.
浣花溪草堂
【简答题】晶态中高分子链呈舒展状态,对于微弱结晶的PVC,如其分子链呈平面锯齿形,氯原子的范德华半径为0.18nm,试问此晶体中的PVC立体构型属于哪一种空间立构?并计算等同周期。(已知C—C键长0.15nm,C—C键角θ为109°28')
【判断题】柴油机的压缩比一般比汽油机的小。()
A.
正确
B.
错误
【单选题】柴油机的压缩比一般( )汽油机的压缩比。
A.
大于
B.
小于
C.
等于
D.
不确定
【判断题】热电偶与显示仪表间采用 “ 三线制 ” 接法。
A.
正确
B.
错误
【多选题】PVC分子主链链节主要按()方式连接的。
A.
头—头
B.
头—尾
C.
尾—尾
D.
C-H
【单选题】柴油机的压缩比一般()汽油机的压缩比。
A.
大于
B.
小于
C.
等于
D.
不一定
【单选题】PVC 具有塑性主要与其分子链之间存在( )有关。
A.
离子键
B.
共价键
C.
分子键
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