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【简答题】

写出强酸型聚苯乙烯离子交换树脂的合成和交换反应的原理。用作离子交换反应和催化反应时有何差别?

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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