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【单选题】
关于股指期货投机交易描述正确的是（）。A.
股指期货投机以获取价差收益为目的
B.
股指期货投机是价格风险转移者
C.
股指期货投机交易等同于股指期货套利交易
D.
股指期货投机交易在股指期货与股指现货市场之间进行
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【简答题】\t常压操作的精馏塔分离苯与甲苯的混合物，进料液含苯50%（摩尔分数，下同），进料量为40kmol/h，且为饱和液体进料；塔顶产品中含苯95%，塔底产品中含苯2%，塔顶采用全凝器，泡点回流，回流比为3.0，物系的平均相对挥发度为2.5。试求：\t（1）塔顶、塔底产品的流量及塔顶产品中苯的回收率；\t（2）精馏段与提留段内每块塔板上升蒸汽及下降液体的摩尔流量；\t（3）精馏段的操作线方程；\t（4）...
【单选题】— What does Justin Bieber’s song Never Say Never impress you most? — It tells us that we _______ do almost anything if we never give up.
A.
can
B.
have to
C.
should
D.
need
【简答题】A)Ignore B) impact C) improve D) impress 1. Steve borrowed his dad’s sports car to his girlfriend. 2. We need to assess the on climate change. 3. Many wines with age.
【简答题】Section B Directions: There are 5 incomplete statements here. You should fill in each blank with the proper form of the word given in brackets. Write the word or words in the correstponding space on t...
【单选题】常压下苯-甲苯体系的平均相对挥发度为2.45,进料液中 =0.4,塔顶馏出液中 =0.95,塔底馏残液含苯为 ≤0.02,试估算全回流所需要的理论塔板数和进料板所在位置(含再沸器)。
A.
6,3
B.
7,4
C.
7,3
D.
6,4
【简答题】Fill in the blanks in the following passage by selecting suitable words below. A) as B)qualities C) confident D) amazed E) idols F) mimic G) constantly H) shared Often when we idoli...
【简答题】Do you think the film is worth ________? A. see B. to see C. seen D. seeing 2. Finally, my sister got a job ________ assistant manager in a bank. A. for B. with C. as D. like 3. It is predicted that t...
【单选题】Your ideas are very interesting, but we need _______ suggestions to get us out of the mess.
A.
impressive
B.
similar
C.
practical
D.
traditional
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