单项选择题
Which of the following statements describes the relationship between viscosity and specific gravity?（）
A.Liquids with different viscosities will always have the same specific gravity
B.Liquids with different viscosities will never have the same specific gravity
C.Viscosity and specific gravity are directly proportional
D.Viscosity and specific gravity are not related in that one does not define or limit the other
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Some chloronated flourocarbon refrigerants may decompose into a toxic irritating gas if it is （）.
A.stored at temperatures below 60 degrees Fahrenheit
B.charged into a system having copper fittings
C.allowed to mix with compressor oil
D.exposed to an open flame or hot surface -
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A refrigeration system contaminated with moisture can be affected by （）.
A.acid formation
B.sludge formation
C.ice in the expansion valve
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单项选择题
R-12 is generally considered to be a safe, nontoxic, nonflammable, and non-explosive refrigerantIt can, however, become highly toxic when （）.
A.superheated outside the system
B.in contact with an open flame
C.heated to the boiling point
D.All of the above
