单项选择题

同地区同结构形式的住宅，下列哪种方案结构工程单价(元/㎡)最高？( )

A.多层
B.14层以下小高层
C.15～20层高层
D.21～30层高层

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根据下面资料，回答51-55题提示：Jane和Michael商量周六去野餐。他们讨论要去什么地方，带些什么。Michael建议邀请John和他的女朋友参加。最后他们决定星期六早上8点出发。Jane:How do you like the idea of having a picnic this SaturdayMichael : Wonderful．But5lJane:What about going to the Western Hills It' s quite cool there．Michael:That' s a good idea．52to go with usJane:OK．And we can ask them to prepare some drinks．Michael．53Jane : You' d better buy some fruit, and sandwiches．Michael．54Jane : I like oranges, watermelons, grapes, and bananas．Michael :55Jane : How about eight o' clock in the morning We can get there in an hour and a half．Michael : OK．I' ll call John and tell him about our plan．第（52）题答案

问答题

精馏和简单蒸馏的本质区别是。

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