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【简答题】

以正丁基锂与少量苯乙烯在乙烷中制得活性聚苯乙烯种子,若取该种子10-3mol·L-1和2mol的新鲜苯乙烯混合,50min内,单体的一半转化为聚合物,试计算kp值。若得单分散聚合物需要什么条件?

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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】不分散聚合物钻井液的特点是()。

A.
密度低、压差小、钻速快
B.
密度高、压差小、钻速快
C.
密度低、压差小、钻速慢
D.
密度低、压差大、钻速快