background
balance beam
beautiful
buildings
colorful
components
crank
economy
electric power
energy
environment
equipment
exploitation
exploration
extraction
fuel
gas
goodlooking
heavy industry
in northern china
in the evening
industry
jack
labor
liquid
machines
metal
oil drilling
oil fields
operation
power
process
processing
pumping unit
rotation
silhouette
steel
storage
swing
technology
the sky
the sun
two units
up and down
定額
Two assignments of the crank balance beam pumping unit in oil field in the eveningの素材 [FY31035278008]
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