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A concrete wall of a cold storage room measures 3.0 m high, 5.0 m wide, and 20 cm thick. The room temperature is maintained at −10℃ and the outside temperature is 20℃. The inside wall is to be covered by a layer of wood in order to reduce the rate of heat loss through the wall BY 90 percent. The thermal conductivities of concrete and wood are 0.80 W/m⋅K and 0.040 W/m⋅K, respectively. Under steady state conditions, the thickness of the layer of wood required is closest to
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