Final answer:
Only one type of refrigerant may be recovered into the same cylinder to prevent chemical reactions, degradation of performance, and regulatory violations.
Step-by-step explanation:
When recovering refrigerants from small systems, it is important to remember that refrigerants must not be mixed. Each recovered refrigerant should be stored in a separate cylinder.
This is because the mixing of different refrigerants can lead to unpredictable chemical reactions, degradation of the refrigerant's performance, and can make the refrigerant non-reusable. Moreover, it is a violation of many regulations to mix refrigerants. Therefore, only one type of refrigerant may be recovered into the same cylinder.