英文關鍵字
voltage
high
electrical
switch
counter
installation
circuit
breaker
substation
contact
electrician
box
cable
device
electric
electricity
energy
industrial
industry
equipment
panel
power
safety
wiring
work
wire
construction
current
technician
engineer
control
line
metal
system
repairman
terminal
technology
automation
manufacturing
meter
builder
supply
mounting
worker
maintenance
repairing
technical
cabinet
fuse
distribution