機器
business
civil
color image
complexity
concrete
construct
construction site
crane
diesel
drill
drive
earth
engineering
excavation
foundation
frame
ground
hammer
heavy
horizontal
hydraulic
industry
job
land
machinery
material
mechanical
merchandise
metallurgy
occupation
people
pile
power
pressure
progress
rig
safety
site
soil
stack
steel
structure
technology
transportation
vehicle
warehouse
work
workplace