A. Annex B
B. Annex C
C. Annex D
D. Annex E
Answer: C
parsing: Gas production standard corresponds to ISO 1217 Annex D.
Answer: It is mainly used in medical, food, electronics, chemical, textile, and other industries where high air quality is required.
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. Price and brand B. Performance, price and brand C. Viscosity and quality of lubricating oil D. Production date and transportation method Answer: C. Viscosity and quality of lubricating oil
Answer: It offers superior energy efficiency, lower maintenance costs, and a longer lifespan.
A. Adopt noise reduction design B. Increase noise C. Reduce power D. Reduce maintenance Answer: A. Designed for noise reduction