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==Historical development==
 
==Historical development==
 
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发展史
 
===[[William Thomson, 1st Baron Kelvin|W. Thomson, Baron Kelvin]]===
 
===[[William Thomson, 1st Baron Kelvin|W. Thomson, Baron Kelvin]]===
 
William Thomson, later Baron Kelvin, (1852 a, 1852 b) wrote
 
William Thomson, later Baron Kelvin, (1852 a, 1852 b) wrote
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