A. Water lubrication B. Oil lubrication C. No need for lubrication D. Special lubricant lubrication Answer: D Analysis: Oil-free air compressors usually use special lubricants to cool and lubricate parts to ensure the purity of compressed air.
A. Monthly B. Quarterly C. Once a year D. The answer depends on usage: D. Depending on usage
Answer: The motor power typically ranges from [C] to [D] kW.
Answer: The flow rate range also varies depending on the specific model, usually covering from a few cubic meters per minute to tens of cubic meters per minute.
Answer: It uses a water-cooled system to maintain optimal operating temperatures.