機器
closeup
coils
construction
crane
dc motor
device
drive
electric
electromagnet
electromagnetism
engine
excavator
factory
force
hand
hydraulic engine
industrial
industry
job
machinery
manufacturing
mechanic
mechanical
mechanics
metal
modern
motor
motor engine
motors
oil
part
parts
plant
power
pressure
pump
repairman
rotate
rotation
rotor
run
serviceman
steel
steering
technology
transport
turbine
winding
work