【多选题】【消耗次数：1】
时间无关性的先决条件是哪些东西不能被外界改变？
①
常量
②
变量
③
指针值
④
资源的状态
参考答案：
复制
纠错
相关题目
【单选题】
（ ）是编制、修订预案的先决条件
【简答题】
指针变量的值是[填空1]。
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