機器
abstract
aircraft
airplane
assembly
auxiliary
background
bolt
braid
closeup
complex
device
electric
electrical
engine
engineering
equipment
factory
gas
hose
hydraulic
industrial
industry
jet
locking of
machinery
maintenance
mechanic
mechanical
mechanism
metal
motor
nut
old
part
parts
pin
pipe
pipes
power
pump
screw
steel
system
technical
technology
turbine
unit
wire
wires
wiring
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