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【简答题】

聚苯乙烯的极性比聚三氟氯乙烯的极性______,而前者的熔点比后者______。

参考答案:
参考解析:
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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