【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
Normal
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7.8 磅
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ZH-CN
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④
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铅垂线
【单选题】
导线全长620m，算得x坐标增量闭合差为0.12m，y坐标增量闭合差为－0.16m，则导线全长相对闭合差为()。
①
1/2200
②
1/3100
③
1/4500
④
1/15500