For success, the scion should be at least _____
A) 1 year old
B) 2 years old
C) 3 years old
D) 4 years old
A
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Which of the following statements about converting a system from one refrigerant to another is correct?
a. Synthetic and mineral oils are fully compatible. b. A new metering device may be required. c. Equipment capacity must remain exactly the same. d. HCFCs can only be replaced by another HCFC.
How many flats does a hex nut have?
A. three B. six C. four D. eight
Why are some reclaimed refrigerants classified as hazardous materials?
A) They have been recycled before being reclaimed. B) They are from pre-1993 systems. C) They may contain corrosive or carcinogenic chemicals. D) They have been through sealed systems.
Flexible wall forms are designed to _____
a. make stripping easier b. be rolled for compact storage c. be used for curved walls d. be quickly assembled