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- operating efficiency 3
- operating expenses 2
- operating experience 2
- operating life 1
- operating mode 2
- operating modes 5
- operating parameters 1
- operating personnel 1
- operating properties 4
- operating repair and maintenance service 2
- operating resource 1
- operating time 2
- operation 27
- operation conditions 1
- operation cost 1
- operation costs 1
- operation duration 1
- operation efficiency 3
- operation life 1
- operation management 1