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2、广义表运算式HEAD(TAIL((a,b,c),(x,y,z)))的结果是：________。
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7、三元素组表中的每个结点对应于稀疏矩阵的一个非零元素，它包含有三个数据项，分别表示该元素的________、________和________。
A. The most important reason to participate in a study abroad program is the opportunity to see the world 1)__________________________.
The powerful, transformative experiences will 2)_____________ in business and in life.—G.P. “Bud”Peterson, President of Georgia Tech
B. Study abroad, like higher education, is 3)_______________________,
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