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【简答题】

聚苯乙烯是一种重要的塑料,尤其是一种良好的绝缘体。泡沫聚苯乙烯是很好的家用器具、精密仪器及其他物品的包装和减震材料。
写出在实验室中从苯和醋酐开始制备苯乙烯的过程,指明所需要的其他试剂或催化剂,阐明每一反应步骤的机理。

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举一反三

【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