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滚动勘探开发(名词解释)

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目前，实现两党制的国家以英国和德国最为典型。()
参考答案：错误

已知一个图的顶点集V和边集E分别为：
V={1,2,3,4,5,6,7};
E={(1,2)3,(1,3)5,(1,4)8,(2,5)10,(2,3)6,(3,4)15,(3,5)12,(3,6)9,(4,6)4,(4,7)20,(5,6)18,(6,7)25};
按照普里姆算法从顶点1出发得到最小生成树，试写出在最小生成树中依次得到的各条边。

__________enough time and money， the investigators would have been able to discover more evidence in this case.

A. Giving
B. Given
C. To give
D. Being given

__________helps students facilitate their process of accumulating vocabulary， broadening

A. Scanning
B. Skimming
C. Extensive reading
D. Intensive reading