问答题

精馏和简单蒸馏的本质区别是。

【参考答案】

回流

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单项选择题

在同一个办公建筑的标准层，采用定新风比全空气系统与采用新风加风机盘管空调系统相比，前者需要的以下哪一项更大？( )

A.空调机房面积
B.新风人口面积
C.附属用房面积
D.排风出口面积

单项选择题

根据下面资料，回答21-35题Sometimes I feel that being the mother of three small children is like operating a large circus(马戏团)．21afternoon last week, my three sons playing peacefully in the back yard ( 院子),22the ball from one to another．I jumped at the chance to talk to one of my friends23the phone, but before I24to the phone, I could tell the boys had begun to quarrel with each other about something．I rushed out to25peace,but before I got there Charles had26a rock at Mark,and hit him in the eye．By the time I got to the back yard,they had begun to27about this．Even David,the oldest boy,who won' t usually fight with anybody about28,was involved(卷入) First,!29them stop fighting, and then ! examined Mark' s eye．I decided that it wasn' t going to develop into a black eye, but I felt that they should30at least a little for31they had done． I' m going to32to your father about this when he comes home tonight, I said． He and I will think of how to punish you． Things were33quiet after that for about half an hour, and then Charles34a glass in the kitchen,and at almost the same35,Mark fell out of the apple tree．第（33）题答案

A.pretty
B.much
C.verymuch
D.alot

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