英文關鍵字
automated
automatic
box
changed
check
closeup
connection
connector
consumption
control
electrical
electricians
electricity
electronic
energy
engineering
factory
finger
hand
house
industrial
industry
installation
male
man
manual
manually
on
panel
plug
power
protection
push
safety
service
station
switch
switchboard
switcher
switchgear
system
technology
tumblers
turn
turning
volt
voltage
wiring
work
worker