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【简答题】

已知聚苯乙烯的玻璃化温度为358K,对聚苯乙烯试样施加一定的应力,求在393K时的蠕变速度比在443K时的蠕变速度快多少?

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

【单选题】蠕变恒速阶段的蠕变速度不应大于()。

A.
1×10mm/(mm•h)
B.
1×10∧-6mm/(mm•h)
C.
1×10∧-5mm/(mm•h)
D.
1×10∧-4mm/(mm•h)