【简答题】用连续精馏塔分离乙醇—水混合液,塔的操作压力p=101.3kPa(绝对压强)。已知:F=4000kg·h -1 ,x F =30%(质量%,下同),泡点进料,塔顶产品含乙醇91%,塔釜残液含乙醇不超过0.5%,在操作压力下,塔顶温度为78℃,塔内蒸气速度u=0.6m·s -1 ,回流比R=2,试求:
【单选题】在乙醇发生的下列反应里,乙醇分子中碳氧键断裂的是 [ ]
【简答题】除构造封闭条件下与外界没有联系的承压含水层外,所有承压水都是由()转化而来。
【判断题】(On Human Nature and Politics) Even gods love to be praised. ()
【单选题】权力制约是指国家机关的权力必须受到( )的规制和约束。
【多选题】权 力制约是指国家机关的权力必须受到法律的规制和约束。在我国,权力制约分为:
【单选题】封建制本身具有同化异族的潜在功能,因为它本身就是针对( )的社会现实。
【单选题】Not only politics but also English is important. In other words, ____ is important.
A.
English, as well as politics
B.
English as well as politics
C.
both politics and English
D.
politics, as well as English