A steam pipe is to be insulated by two insulating materials put over each other . For best results__________________?
(A) better insulation should be put over pipe and better one over it
(B) inferior insulation should be put over pipe and better one over it
(C) both may be put in any order
(D) whether to put inferior OIL over pipe or the better one would depend on steam temperature
(E) unpredictable
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