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【简答题】

从聚苯乙烯废料中回收苯乙烯单体时,发现在350℃真空系统中进行聚苯乙烯热降解可收得40%的单体,问若将热降解温度提高到410℃时,能否增加单体的回收率?说明理由。

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【单选题】Desperately short of living space and dangerously prone to flooding, the Netherlands plans to start building homes, businesses and even roads on water. With nearly a third of the country already cover...

A.
most parts of the country are covered by water
B.
the country is constantly threatened by floods
C.
it will promote the cultivation of flowers
D.
people think it better to live on water

【单选题】四元轴烯t、苯乙烯b及立方烷c的分子式均为C 8 H 8 。下列说法正确的是( )

A.
b的同分异构体只有t和c两种
B.
t、b、c的二氯代物均只有三种
C.
t、b、c中只有t的所有原子处于同一平面
D.
t、b、c中只有t和b能使酸性KMnO4溶液褪色