近年来,化学作为高考科目,其试题的模式变化不是很大,有一类考题即框图式的,其特征是卷面上有特定的一系列方框,作答时须经过一系列的思维推理过程,综合地利用中学化学知识间的联系,此类考题于 In recent years, as a college entrance examination subject, chemistry has not changed the pattern of its examination questions very much. There is one type of examination questions, namely, a block diagram type. It is characterized by a series of specific boxes on the reel. When answering, it requires a series of thinking and reasoning processes. Comprehensive use of the links between chemical knowledge in middle school, such questions in