A. water-lubricated
B. oil lubrication
C. no lubrication
D. Lubrication with special lubricants
Answer: D
Analysis: Oil-free air compressors usually use special lubricants to cool and lubricate parts to ensure the purity of the compressed air.
A. Home use B. Commercial places use C. D. Agricultural production use answer: C. Industrial use
Answer: It consumes less energy and operates more efficiently, resulting in lower operating costs.
A. High energy consumption B. Low energy consumption and high efficiency C. Maintaining complex D. High noise answer: B. Low energy consumption and high efficiency
A. Dust content B. Oil content C. Dew point temperature D. Pressure fluctuations Answer: B Analysis: Oil mist emissions violate environmental regulations, and environmentally friendly oil-free air compressors combined with environmental management system certification can ensure compliance.
A. Produce lubricating oil B. No lubricating oil C. Need to replace lubricating oil frequently D. High noise answer: B. No production of lubricating oil