【单选题】
若一个图的边集为{,,,,,}，则从顶点1开始对该图进行广度优先搜索，得到的顶点序列可能为（ ）。
①
1,2,3,4,5
②
1,2,4,3,5
③
1,2,4,5,3
④
1,4,2,5,3
【单选题】
若一个图的边集为{,,,,,}，则从顶点1开始对该图进行深度优先搜索，得到的顶点序列可能为（ ）。
①
1,2,5,4,3
②
1,2,3,4,5
③
1,2,5,3,4
④
1,4,3,2,5
【单选题】
A点坐标为（10、20、30），B点坐标为（30、20、30）则AB距离为______。
①
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7.8 磅
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ZH-CN
X-NONE
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②
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③
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④
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铅垂线