機器
binding
blowdown
blowdown valve
boilerhouse
burner
closeup
cog
cogwheel
condensing
connection
control
electrical
element
energy
engineering
equipment
factory
fastened gears
fuel and power generation
gas
gear
hardness
heat
indoor
industrial
industry
lubrication
machinery
manometer
manufacturing
mechanical
mechanics
mechanism
metal
metallic
nobody
objects
part
plant
power
steam
steel
system
technology
teeth
transmission
treatment
valve
warming