GPS高差转换
GPS height difference transformation
GPS Height Differences Transformaition
GPS精密高差测量
GPS leveling of precise height difference
T型高差固定结构
T-shaped exit fixed mechanism
标高差改正
correction for skew normals
磁场中心高差
level difference between magnetic-cores of stator and rotator
大高差
big height difference
large height difference
high difference in level of span
大高差地段
big height difference section
等高差
equation of equal altitude