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【简答题】
听下面一段材料，回答第1-4题。 1. Where does the fresh water people need come from? A. Rivers and lakes. B. Underground. C. Both A and B. 2. How much water can we drink of all the water the world? A. 3%. B. 97%. C. 4%. 3. What is the speaker mainly talking about in this passage? A. The ways of getting fresh water. B. How to use fresh water in our daily life. C. AII people in the world should save water. 4. Which of the following is true? A. Hunger is the only problem in the world. B. Water shortage is the only problem in the world. C. Scientists have been working hard on solving water shortage.
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【单选题】在一填料塔中用净油来吸收混合气体中的苯,已知混合气体的总量为1000m3/h,其中苯的体积分率为4%,操作压强为101.3kPa温度为293K,吸收剂的用量为kmol/h,要求吸收率为80%,塔度底苯溶液的浓度为( )kmol/kmol。
A.
0.01
B.
0.013
C.
0.02
D.
0.026