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Some thermal mugs have layers of materials to keep drinks hot for as long as
possible. Which combination of layers would work best for this purpose?
OA. Inner core of steel, no air gap, outer layer of glass
B. Inner core of steel, air gap, outer layer of plastic
C. Inner core of steel, no air gap, outer layer of plastic
D. Inner core of glass, air gap, outer layer of plastic
Sagot :
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