| http://www.w3.org/ns/prov#value | - Since the center portion of the recessed conical surface is close to the heat-generating electronic parts, the center portion of the recessed conical surface has a small thermal resistance to easily absorb heat, and the recessed conical surface is an inclined surface having a stepped portion, the flow of the refrigerant is made turbulent easily, and the heat is transferred easily.
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