题目：
栈和队列的共同点是( )。
A．都是先进后出
B．都是先进先出
C．只允许在端点处插入和删除元素
D．没有共同点
答案：
参考答案：C
栈和队列的共同点是( )。A．都是先进后出 B．都是先进先出 C．只允许在端点处插入
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