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<img border="0" src="images/9_25_4.gif" align = left width="336" height="122">图２（d）中的循环语句注销的定值集合是什么？<p>
解析：简单地说，循环不影响gen和kill。如果定值d由S1注销，那么S1和S的结束点它都不能到达。反过来，如果定值d由S注销，那么S1和S的结束点它也不能到达。所以我们认为:
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<p> <span style="FONT-SIZE: large">kill[S]= kill[S1]</span></td>
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