英文關鍵字
crane
industry
boom
build
construction
development
hook
industrial
machinery
metal
site
tower
assembly
cable
capacity
counterweight
dogger
engineering
guyline
heavy
horizontal
jib
lift
lifting
load
luffing
mast
operator
operators
outrigger
project
rigger
sheaves
steel
structure
strut
swamper
weight
weights
winch
wire