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r-value
释义
WordReference Random House Unabridged Dictionary of American English © 2024
R-val•ue
(är
′
val′yo̅o̅),
USA pronunciation
n.
Building
a measure of the resistance of an insulating or building material to heat flow, expressed as R-11, R-20, and so on;
the higher the number, the greater the resistance to heat flow. Cf.
U-value.
R,
symbol for
resistance
1945–50
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更新时间:2025/7/25 3:51:38