英文關鍵字
accumulator
acid
alarm
backup
battery
business
cable
cellular
center
commercial
communication
danger
dmitrov
electric
electricity
electronics
energy
enterprise
equipment
facility
high
illumination
indoor
industrial
industry
lamp
light
many
megafon
megaphone
motion
network
nobody
power
protect
protection
rack
reliability
room
row
safe
source
supply
system
technology
telephone
tilt
transformer
voltage
wide