【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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②
Normal
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③
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正平线
④
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铅垂线
【多选题】
2．重点高程坡向标注法是在平面地形图上，将某些特殊点，如（ ）用十字或圆点或水平三角标记符号来表明高程，用细线小箭头来表示地形从高至低的排水方向。
①
园路交叉点
②
建筑物的转角基底地坪
③
园桥顶点
④
涵闸出口处
⑤
假山基础