【单选题】【消耗次数:1】
设论域为整数集,下列真值为真的公式是(   )
<imgwidth="116"height="20"src="../uploadfiles/word/lsss001.files/image023.png">
<imgwidth="116"height="20"src="../uploadfiles/word/lsss001.files/image024.png">
<imgwidth="119"height="20"src="../uploadfiles/word/lsss001.files/image025.png">
<imgwidth="134"height="20"src="../uploadfiles/word/lsss001.files/image026.png">
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