下列集合定义正确的是 A: sets:a/1,2,3/:x；endsets B: setsa{1,2,3}:x；endsets C: sets:a{1,2,3}:x；endsets D: seta{1..3}:xendset
下列集合定义正确的是 A: sets:a/1,2,3/:x；endsets B: setsa{1,2,3}:x；endsets C: sets:a{1,2,3}:x；endsets D: seta{1..3}:xendset
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