A.≤0℃
B.≤-10℃
C.≤-20℃
D.≤-30℃
Answer: C
Analysis: The spraying process requires compressed air dew point ≤-20℃ (PDP) to prevent moisture condensation from affecting the coating quality.
Answer: It should be installed in a cool, dry place with adequate ventilation and away from sources of heat and moisture.
A. 1-3% B. 8-12% C. 15-25% D. 30-40% Answer: B Analysis: The gap leakage loss of the screw machine is 8-12%, and the reciprocating gap volume loss is even higher.
Answer: Follow the manufacturer’s instructions for pipe sizing, connections, and routing.
A. Price and brand B. Performance, price and brand C. Appearance and color D. Production date and transportation method Answer: B. Performance, price and brand
Answer: It ensures the purity of compressed air, which is essential for food safety and quality.