题目内容
在 LR(0) 的 ACTION 子表中，如果某一行中存在标记为 "ri ”的栏，则。
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若 B 为非终结符，则 A → a · B β为 ____ 项目。
若项目集 Ik 含有 A → a ·，则在状态 K 时，无论面临什么输入符号都采取“ A →α归约”的动作一定是。
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