题目内容
A __________ operation adds an item to the top of the stack.
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The operation of removing an element from the stack is said to __________ the stack.
The stack members include a __________（列表）, an __________（索引）or __________（指针） to the top of the stack and the set of __________ __________（栈操作）.
Stack is a kind of last in, first out（LIFO） data structure.
The “stack full” condition means that you cannot remove an element to the stack.
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