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<img border="0" src="images/9_25_1.gif" align = left width="357" height="126">根据定义写出图２（a）中语句S的kill[S]。<p>
解析：d是唯一的定值，不管它是否到达开始点，它肯定到达该语句的结束点，它注销了a在程序中的所有定值。所以: </p>
<p> <span style="FONT-SIZE: large">kill[S]=Da-{d}</span></td>
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