R-12 is generally considered to be a safe, nontoxic, nonflammable, and non-explosive refrigerantIt can, however, become highly toxic when （）.<br>A:superheated outside the system<br>B:in contact with an open flame<br>C:heated to the boiling point<br>D:All of the above

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

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