gre 数学中的a stack of

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gre 数学中的a stack of
如题，有题中有出现这个词，有确切的数量吗？是12个还是？？

除了告你dozen，gre不会用这种词告你数量的，跟高考不一样哈哈，要是出现就认为是一堆
韦氏中是这样说stack的（作为名词）：
1 : a large usually conical pile (as of hay, straw, or grain in the sheaf) left standing in the field for storage
2 a : an orderly pile or heap b : a large quantity or number
3 : an English unit of measure especially for firewood that is equal to 108 cubic feet
4 a : a number of flues embodied in one structure rising above a roof b : a vertical pipe (as to carry off smoke) c : the exhaust pipe of an internal combustion engine
5 a : a structure of bookshelves for compact storage of books ? usually used in plural b plural : a section of a building housing such structures
6 : a pile of poker chips
7 a : a memory or a section of memory in a computer for temporary storage in which the last item stored is the first retrieved; also : a data structure that simulates a stack *a push-down stack* b : a computer memory consisting of arrays of memory elements stacked one on top of another
没有任何一个意思是有数字的，你就放心吧

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