機器
aluminum
backup
blue
cartridge
closeup
cold
complex
connection
construction
control
efficient
energy
engineering
equipment
flow
fluid
gray
heavy
hose
hydraulic
industrial
industry
machinery
mechanic
mechanical
metal
mineral
mobile
nitrile
o ring
oil
oring
pipe
power
pressure
ring
rubber
science
seal
shiny
steel
system
tech
technology
tool
valve
water