機器
background
big
bolt
carbon
connection
construction
crude
engineering
equipment
flange
flow
gas
gasket
hardware
heavy
horizontal
industrial
industry
iron
joint
large
leak
leakage
metal
metallic
nobody
nut
nuts
object
oil
oilfield
old
pipe
pipeline
pressure
pump
repair
screw
seal
seam
steel
stud
thread
tool
trading
tube
valve
welding
wellsite