Answer: It alerts the operator with visual and audible warnings, and provides diagnostic information to help identify the problem.
A. Large flow and high power are conducive to energy conservation B. Compact structure and good sealing effect C. Smooth operation and reliable operation D. These are all answers: D. all of the above are
Answer: It should be installed in a cool, dry place with adequate ventilation and away from sources of heat and moisture.
Answer: It offers superior energy efficiency, lower maintenance costs, and a longer lifespan.
A. 1873 B. 1871 C. 1965 D. Answer in 2017: A. in 1873