A. high cost
B. limited application
C. maintain complex
D. Compressed air has high oil content
Answer: D
Analysis: Disadvantages of oil-free air compressors include high cost and limited scope of application, but low maintenance costs, pure compressed air and no oil content.
A. Wear of cylinder head and air liner B. Piston and piston rod damage C. Valve assembly failure D. These are all answers: D. all of the above are
A. 15 B. 30 C. 45 D. 60 Answer: C Analysis: Through energy efficiency optimization, the 110kW model can save annual electricity bills of up to 450,000 yuan, directly reducing operating costs.
A. Gas separation and storage B. Home use of C. Commercial places use D. Agricultural production uses answer: A. Gas separation and storage
A. Higher B. Lower C. Same as oil injection air compressor D. The answer cannot be determined: A Analysis: The manufacturing cost of oil-free air compressors is usually high, and the initial investment is large, but the long-term maintenance cost is low.
A. Low level of protection B. High level of protection C. Low power D. High noise answer: B. high protection level