structural

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• 英语翻译Building MaterialsThere are several kinds of buildings,with the most obvious distinction beingcommercial and residential.Commercial buildings vary greatly in size,type ofconstruction,number of stories,and intended use.One-story buildings oftenlook like large boxes on concrete slabs,as this provides maximum floor spaceand minimum structural frame.There are many kinds of residential buildings,varying greatly in style,grandeur,and number of individua
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• structural
• 1、How is base strength related to the availability of the electron-pair?2、Define (i) a nuclephile or electron-donor and (ii) an electrophile or electron-acceptor.3、What structural units make a molecule (or ion)(i)a nucleophile or (ii)an electrophile?4、What kind of reaction occurs between a nucleophile and electrophile?
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