Molecular formula :
nature : heat source heat transmission cooler objects and make it heat process. According to the thermal access can be divided into direct and indirect two. Direct heat is the heat heating increases in direct materials, ephemeral Road gas heating, electrical heating and solar radiation heating. Indirect heat is the heat source directly above the heat source heating can be added to an intermediate body heat, and then by the middle of heat-heat could pass materials, such as steam heating, hot water heating, heating oil and other minerals.
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