機器
air
analytical
background
bottle
chemical
closeup
control
cylinder
cylinders
danger
dangerous
decrease
energy
equipment
fluid
fuel
gas
gauge
healthy
hospital
industrial
industry
instrument
isolated
lab
laboratory
material
measure
measurement
medical
metal
meter
object
oxygen
physical
power
pressure
propane
protection
reduce
regulator
regulators
risk
scale
steel
supply
tank
technology
valve
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