【单选题】【消耗次数：1】
线性规划最优解不唯一是指（）。
①
可行解集合无界
②
存在某个检验数λk0且aik≤0(i=1,2,…,m)
③
可行解集合是空集
④
最优表中存在非基变量的检验数为零
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