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【单选题】
原发性下肢静脉曲张的原因 错误的是
A.
妊娠
B.
习惯性便秘
C.
咳嗽
D.
长期重体力劳动
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A.
How interesting
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What an inter esting
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How interesting an
D.
What interesting an
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【简答题】用一连续精馏塔分离由组分A、B所组成的理想混合液。原料液中含A0.44,馏出液中含A0.957(以上均为摩尔分数)。已知溶液的平均相对挥发度为2.5,最小回流比为1.63,请说明原料液的热状况,并求出q值。
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