機器
abstract
assembly
background
close
closeup
combustion
complex
design
development
device
energy
engine
engineer
engineering
experiment
factory
fuel
gear
illustration
industrial
industry
laboratory
ladder
machinery
manometer
mechanic
mechanical
metal
modern
part
pipe
piping
power
precision
pressure
research
rotation
science
steam
steel
structure
system
technical
technology
transportation
tube
turbine
up