機器
3d
arrow
bar
building
certificate
chart
class
classification
color
concept
construction
consume
consumption
cost
diagram
ecological
ecology
economic
effective
efficiency
efficient
electric
electricity
energetic
energy
environment
graph
green
heating
high
home
house
icon
illustration
label
level
low
power
protection
rating
red
save
scale
sign
standard
symbol
technology
washing