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问题
填空题
网络拓扑结构设计过程中搭建网络拓朴结构时，每个站点要用一个正六边形来表示，要求正六边形的边长是覆盖半径的（）倍
答案
参考答案：√3/2
选择题
I saw his mother ______ him down on the bed and he _____ there quietly. But I never knew his mother was ______ to me when saying he was dying.
A. lay; lied; lying
B. laid; lay; lying
C. lain; lay; lieing
D. laid; lied; lieing
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问答题
将下列山地部位（山脊、山谷、鞍部）描图与相应的等高线图用直线连起来
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