A. Low level of protection B. High level of protection C. Low power D. High noise answer: B. high protection level
A. Price and brand B. Performance, price and brand C. Market share and technological innovation D. Production date and transportation method Answer: C. Market share and technological innovation
A. Small flow B. Low power C. Not suitable for occasions with small gas volume and too high pressure ratio D. Complex structure answer: C. Not suitable for occasions with small gas volume and too high pressure ratio
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
Answer: First, check the fault indicator lights and alarm messages, and troubleshoot and handle according to the prompts. If the problem cannot be solved independently, contact professional maintenance personnel promptly.