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three-point intersection
 three-point intersection
expl. 后方交会
hydroel.st. 后方交会
oil 三点交会
| in space
 in space
math. 在空间

to phrases
three-point intersection
expl. 后方交会在待定点上,对三个已知点观测其方向值,以计算待定点坐标的测量方法
hydroel.st. 后方交会
oil 三点交会
tech. 三点法交会
three-point intersection in space
: 1 phrase in 1 subject
Technology1