A. 50%
B. 60%
C. 75%
D. 80%
Answer: C
Analysis: Environmentally friendly oil-free air compressors reduce oil pollution, thereby reducing the frequency of filter replacement and optimizing maintenance costs.
A. Screw B. Piston C. Centrifugal wheel D. Scroll disk answer: B. piston
A. Color difference B. Orange peel phenomenon C. Fisheye defect D. Hanging answer: C analysis: Oil residue will cause “fish eye” defects on the surface of the car paint, seriously affecting the coating quality.
Answer: “Low pressure” refers to the compressor’s ability to operate at relatively low pressure levels, making it suitable for applications that require low-pressure compressed air.
Answer: Water lubricates the screw elements, cools the compressor, and helps to maintain optimal operating conditions.
A. Oil coking B. Dust accumulation C. Insufficient pressure D. Answer: A Analysis: Coking oil will block the optical path system of the laser welding machine, resulting in a single maintenance cost exceeding 500,000 yuan.