A composite flat wall of a furnace is made of two materials A and B. The thermal conductivity of A is twice of that of material B, while the thickness of layer of A is half that of B. If the temperature at the two sides of the wall are 400 and 1200K, then the temperature drop (in K) across the layer of material A is________________?
A. 133
B. 160
C. 150
D. 125
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