14. The nominal displacement of an air compressor is 20m³/min, and the measured gas production is 16.8 m ³/min. The possible reasons are not included?

A. Portable air compressor B. Industrial air compressor C. Medical air compressor D. Mine air compressor Answer: A. portable air compressor

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

A. Pressure and temperature B. Oil quantity and pressure C. Temperature and oil quantity D. The answer cannot be determined: A Analysis: The control system of an oil-free air compressor is mainly used to monitor and control the operating parameters of the compressor, such as pressure and temperature.

A. Spraying and sandblasting operations B. Home use of C. Commercial places use D. Agricultural production uses answer: A. Spraying and sandblasting operations

A. Monthly B. Quarterly C. Once a year D. The answer depends on usage: D. Depending on usage