精馏操作就其本质来讲是一个（）的交换过程。
A.质和热
B.动能和热能
C.汽体液化
D.热量形式
参考答案：A
— Do you want anything else for your birthday?
— Nothing else. I'm very ________ with what you've bought me. [ ]
A. satisfying
B. disappointed
C. content
D. honest
合理化
