高程起算点水准面的位
potential of level surface passing through height
总α计数法相对标准偏差
Relative standard deviation
总体标准差估计
estimation of population standard derivation
组合标准线规
combination standard gauge
最大核准起飞重量
maximum take-off weight authorized (MTWA
最大准直距离
maximum non-diffraction distance
the Zmax
maximum collimating distance
最简准下三角阵
simplest quasi-undertriangular matrices