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1Ŀ꣺  רҵᶨ¡ǡ塢ȫ淢չһĿѧĻˮƽõְҵºʹʶ󾫵Ĺ񣬽ǿľҵͿɳչձרҵ֪ʶͼܣҵҵԱշԱְҵȺܹ۹ʡղƷۡ鿱𡢶ֳȹĸʼ˲š

2Ҫγ̣  ýۡýӪ߻ӪƵֱ ӪýӪۡĻӪʵʵ⡢гԤ⡢ѡ άҵȡ

3 ҵ  ҵ4 S ꡢҵĻҵݱ ˾ռ˾ֳ ҵάޱҵȵλ ۹ʡǰ̨ӴSA ƷרԱרԱרԱ ʦܡܡ ۾⾭4Sܾ͹˾4Sܼȸλְҵ

4  רҵעѧ ʶμȫְҵԺУܴ һ -ӪٻȽβμȫеҵܴȫ ְרԺУ´ҵѼȫһȽ1ΣȽ2Σ μȫóӪһȽȫҵְҵܾӪʡ һȽȽʡְҵԺУ ܴӪȽ