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铅垂线
释义
铅垂线plumb line plummet 铅垂线qiānchuíxiàn(1)[plumb line]一端有垂球或其他重物的线或绳,供确定垂直度用(2)[geographic vertical]大地水准面的法线方向(3)[perpendicular]与水平面以直角相交的直线;竖直线
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更新时间:2026/5/14 21:10:49