Compared with traditional models, the average annual maintenance cost of environmentally friendly oil-free air compressors can be reduced by about tens of thousands of yuan?

A. Backwardness of energy-saving technology B. Advanced energy-saving technology C. Don’t pay attention to energy-saving technologies D. General answer to energy-saving technology: B. Advanced energy-saving technology

A. Low level of protection B. High level of protection C. Low power D. High noise answer: B. high protection level

Answer: It includes regular inspections, changing the lubrication water, and cleaning the air filter.

A. Noise is loud B. Low efficiency C. Maintaining complex D. Low noise and high efficiency Answer: D. Low noise and high efficiency

A. Stable growth B. Volatility growth C. Declining year by year D. Stagnation Answer: A. steady growth