【简答题】I was down town yesterday, and decided to stop at the bank to see Alice Green. I th ought she might have time to have lunch with me. When I got to the bank, I was told that she had just been out for a...
在已知相平衡线的等腰直角三角形相图上,采用作图法,可以根据萃余相 R 中 A 的质量分数定出萃余相点,由辅助线经过作图试差作出过萃余相 E 点的平衡联结线,交相平衡线得到萃取相点,可以读出萃取相的组成。
B.
本题采用计算法模拟 A 的过程,计算得到萃取相中萃取剂和溶剂的质量分率分别约等于 0.34 和 0.26 。
C.
采用作图法,连接原料液组成点 F 和纯溶剂组成点 S 的直线 FS 交 RE 得到混合点 M ,根据图上有关长度,可以用杠杆规则求出萃取剂 S 的用量。本题用计算法模拟这一过程所得到的混合点 M 的 A 、 S 和 B 的质量分率分别约等于 0.245 、 0.185 和 0.571 ,萃取剂用量约等于 153.2kg 。
【简答题】We were on our way home from Houston one Saturday morning. We decided to stop at a local gas station to get coffee and something to snack on since it was a good hour and a half before we got home. Whe...
【单选题】Part 1 : Vocabulary in Context 2. In the excerpt below, the word rift means: “I decided to stop being friends with George... Our classmates, sensing that they had created a rift between George and me,...