A. Low level of protection B. High level of protection C. Low power D. High noise answer: B. high protection level
A. Volume efficiency loss B. Air compressor brand premium C. Intake air temperature D. Filter pressure loss answer: B Analysis: Gas production is affected by mechanical efficiency, environmental factors and system matching, and has nothing to do with the brand.
A. Nitrogen purge loss B. Brand premium cost C. Advertising intensity D. Equipment appearance aesthetics Answer: A Analysis: High-end industries need to consider nitrogen purging and monitoring sampling losses.
A. Brand and model B. Color and appearance C. Production date D. Answer to transportation method: A. make and model
Answer: It can be determined by observing the pressure differential indicator of the water filter or based on usage time and water quality.