direction of the surveying line
Aerial Surveying
航空测量
控制力矩陀螺
航空摄影测量
架空索道
航天摄影测量
航测
digital aerial surveying
A line used as both sterile and maintaining line
agonic line {agonic line of no declination}
Dual purpose line with nucleic male sterile line
Fault Cutoff Line Allan Line
Male sterility line and maintainer line
velocity line of arc line short band
0-1 symmetric matrix of positive line
±500 kV ultrahigh voltage DC transmission line
1 000 kV AC power transmission line