level-point reference
level-point参考
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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。
youdao
应用推荐
模块上移
模块下移
不移动