英文關鍵字
bobbin
business
cable
circle
component
conductor
conveyor
copper
electric
electrical
electrician
electricity
electromagnetic
energy
engineering
factory
hardware
heavy
inductor
industry
machine
manufacturing
metal
metallic
orange
plant
power
process
production
reactive
reel
roll
spiral
steel
supply
technology
transformer
voltage
winding
wire
wiring
work