non-condensable gas vent line
vent line
排气管线
排出管线
排放管线
导压外引管路
排气管路
通气管路
vent valve line connection
vent valves line connection
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