英文關鍵字
arc
background
built
conduction
connection
construction
cylinder
detail
energy
engineering
equipment
factory
form
formation
gas
heat
industrial
industry
iron
line
manual
manufacturing
metal
metallurgy
metalwork
occupation
part
pattern
pipe
pipeline
plant
plumbing
power
production
repair
safety
steam
steel
together
tool
tube
tubing
valve
water
weld
welder
welding
work
workplace
workshop