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今有两种组成相同而细微结构不同的聚合物：苯乙烯-甲基丙烯酸甲酯无规共聚物，聚苯乙烯与聚甲基丙烯酸甲酯(4:6)的共混物。它们的热失重曲线(TG曲线)非常相似，用红外光谱、核磁共振等技术也难以区别。但根据在加热失重过程中，相当于TG曲线上3 * 和4 * 两个取样点的GC谱图(图11-32)和由GC峰面积计算的数据(表11-3)，就很容易区别了。试利用这些谱图和数据解释如何区别这两种聚合物。 表11-3　两种聚合物的TG-GC分析数据 聚合物(取样点) 相对峰面积(1000份计算) 苯 MMA St St二聚体 共混物 1 * 151.0 3.2 2 * 17.2 5.3 3 * 84.4 7.2 1.3 4 * 15.0 249.7 10.5 共聚物 1 * 2 * 7.2 7.0 0.9 3 * 91.1 131.6 1.5 4 * 92.1 162.3 2.3
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参考答案：
举一反三
【单选题】At last the policemen used tear gas to ______ the demonstrators.
A.
disperse
B.
dispatch
C.
disappear
D.
vanish
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【单选题】听力原文：W: There must be a thunderstorm in some place, because the picture isn't very sharp and the sound isn't clear. M: I think you are right. They said on the radio last night that a storm was coming ...
A.
Looking at the photos.
B.
Listening to the radio.
C.
Watching television.
查看完整题目与答案
【单选题】The ______ of the picture on our television isn't very good. [     ]
A.
qualities
B.
quantity
C.
quantities
D.
quality
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【多选题】关于N52发动机装备的三级可变DISA，下列描述正确的是（）
A.
DISA风门采用真空控制
B.
DISA风门采用电动控制
C.
在发动机转速较低状态，两个DISA风门都处于关闭状态
D.
在中等转速范围，两个DISA风门都处于打开状态
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【多选题】按规定龄期的( )和( )来划分水泥的强度等级。
A.
抗压强度
B.
屈服强度
C.
抗折强度
D.
弹性模量
查看完整题目与答案
【简答题】Chirs was _____(disappoint) with his low score on the exam.
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【单选题】At the end of the passage the author seems to suggest that life in future is ______.
A.
disastrous
B.
unpredictable
C.
exciting
D.
colourful
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【简答题】How willKim meet Chirs's friend?
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【单选题】水泥强度等级是按规定龄期的______来划分的。
A.
抗压强度
B.
抗折强度
C.
抗拉强度
D.
A和B
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【单选题】According to the passage, what leads to the lack of qualified workers in the US?
A.
The disadvantages of the agrarian-age education system.
B.
The shortage of work opportunities due to the declining economy.
C.
The cooling of American economy.
D.
Both the education system and the workforce classification.
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相关题目：
【单选题】At last the policemen used tear gas to ______ the demonstrators.
A.
disperse
B.
dispatch
C.
disappear
D.
vanish
查看完整题目与答案
【单选题】听力原文：W: There must be a thunderstorm in some place, because the picture isn't very sharp and the sound isn't clear. M: I think you are right. They said on the radio last night that a storm was coming ...
A.
Looking at the photos.
B.
Listening to the radio.
C.
Watching television.
查看完整题目与答案
【单选题】The ______ of the picture on our television isn't very good. [     ]
A.
qualities
B.
quantity
C.
quantities
D.
quality
查看完整题目与答案
【多选题】关于N52发动机装备的三级可变DISA，下列描述正确的是（）
A.
DISA风门采用真空控制
B.
DISA风门采用电动控制
C.
在发动机转速较低状态，两个DISA风门都处于关闭状态
D.
在中等转速范围，两个DISA风门都处于打开状态
查看完整题目与答案
【多选题】按规定龄期的( )和( )来划分水泥的强度等级。
A.
抗压强度
B.
屈服强度
C.
抗折强度
D.
弹性模量
查看完整题目与答案
【简答题】Chirs was _____(disappoint) with his low score on the exam.
查看完整题目与答案
【单选题】At the end of the passage the author seems to suggest that life in future is ______.
A.
disastrous
B.
unpredictable
C.
exciting
D.
colourful
查看完整题目与答案
【简答题】How willKim meet Chirs's friend?
查看完整题目与答案
【单选题】水泥强度等级是按规定龄期的______来划分的。
A.
抗压强度
B.
抗折强度
C.
抗拉强度
D.
A和B
查看完整题目与答案
【单选题】According to the passage, what leads to the lack of qualified workers in the US?
A.
The disadvantages of the agrarian-age education system.
B.
The shortage of work opportunities due to the declining economy.
C.
The cooling of American economy.
D.
Both the education system and the workforce classification.
查看完整题目与答案
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