Which of the following statements about ammonia as a refrigerant is true?
a. Ammonia is slightly less efficient in heat transfer than halocarbon refrigerants.
b. Ammonia costs more than other common refrigerants.
c. Ammonia is poisonous and must be handled with extreme care.
d. Ammonia piping cannot be constructed from copper.
d
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To remove green stains from a wall, spray the wall with _____ .
A. a muriatic acid solution B. water C. a solution of potassium or sodium hydroxide D. a solution of acetic acid and hydrogen peroxide
Two systems used to deliver water to seed flats are ________ and ________.
Fill in the blank(s) with the appropriate word(s).
Pork is the most widely eaten meat in the world.
Answer the following statement true (T) or false (F)
In industrial applications, manually operated valves are generally used.
Answer the following statement true (T) or false (F)