What is the discharge capacity range of this series of compressors?

A. Screw B. Piston C. Centrifugal wheel D. Scroll disk answer: B. piston

A. Produce lubricating oil B. No lubricating oil C. Need to replace lubricating oil frequently D. High noise answer: B. No production of lubricating oil

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 uses water as the lubricant, eliminating the need for oil and reducing the risk of contamination.

A. 5% B. 11% C. 20% D. 30% answer: B Analysis: For every 1000 meters increase in altitude, the air density drops by about 11%.