...水准点高程、基面关系式 [gap=327]Key words: absolute basal plane, freeze the basal plane, the station surface, elevation of the level point, the base surface relationship ..
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The highest point is the Northwest Xiangshan County, elevation 447 meters, the lowest point in the county because the town southeast of Grand Village of the Li Di, 8 meters above sea level.
最高点是县城西北象山，海拔447米，最低点在县城东南大因镇的李家迪城村，海拔8米。
At one point at an elevation of about 5500 feet above sea level the students pick up dozens of marine fossils.
学生们在海拔约5500英尺高度的地方，采集到了几十种海底化石。
Obstacle-free sector is a sector formed by an arc originating at the reference point of the edge of a helideck and extending outward in the horizontal plane level with the elevation of the helideck.
无障碍区域是由一个起于直升机甲板边缘的基准点并在直升机甲板的水平面向外延伸的弧形所形成的区域。
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