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单词 british thermal unit
释义 british thermal unit
noun
Usage: usually capitalized B
: the quanity of heat required to raise the temperature of one avoirdupois pound of water one degree Fahrenheit at or near 39.2° F, its temperature of maximum density, being equal to about 0.252 kilogram calorie — abbr. Btu
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更新时间:2024/9/22 12:41:11