機器
architectural
bigdiameter
biginch
breech
building
caterpillar
civil
conduit
construction
constructionandassembling
crane
development
energy
engineering
force of siberia
gas
gas pipeline
highpressure
industry
internally
laying
line
natural
nord stream
of
oil
oil pipeline
operations
pipe
pipelaying
pipeline
pipelining
pipes
piping
power
pressure
pressurized construction
racker
repair
south stream
technique
tractor
transfer
transmission
transport
transportation
trunk
tube
tubing