A. 0.5-0.6
B. 0.7-0.85
C. 0.9-1.0
D. 1.1-1.2
Answer: B
parsing: When selecting a model, it needs to be multiplied by an efficiency factor of 0.7-0.85.
A. Adopt energy-efficient design B. Increase noise C. Reduce power D. Reduce maintenance Answer: A. Adopt energy-efficient design
A. Portable air compressor B. Industrial air compressor C. Medical air compressor D. Mine air compressor Answer: A. portable air compressor
A. General B. Poor C. Better D. Very good answer: D. very good
Answer: The advantages include no oil contamination, low maintenance costs, long service life, and high energy efficiency.
A. 100 B. 300 C. 500 D. 800 Answer: D Analysis: Coating defects caused by oil pollution can cause annual losses of more than 8 million yuan for a single production line, highlighting the importance of oil-free air compressors.