direction of the surveying line
surveying-line and checking-line sounding data
Finishing surveying of pipe line
investigation and surveying of overhead line
Double line-line voltage control
line-line extreme distance
line-line topological relation in traffic network
loss-free line (=lossless line =lossless transmission line)
SDSL Single-Line Digital Subscriber Line，Single-Line DSL
10-line to 4-line BCD encoder
A line used as both sterile and maintaining line
agonic line {agonic line of no declination}
cytoplasmic male sterile line CMS-line
double line to line voltages
double line-to-line voltage control