【单选题】
A点坐标为（10、20、30），B点坐标为（30、20、30）则AB距离为______。
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铅垂线
【单选题】
已知三点A（10、20、15）、B（10、0、30）、C（0、10、0），则在坐标面上的点为______。
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A、B、C三点
②
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B点
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B、C两点
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C点