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1. Dittus-Boelter equation, NNu=0.023 (NRe)(NPr)n, where n = 0.4 for hot fluid and n = 0.3 for cold fluid, is applicable for
(A): 10000
Re<1.2×10
5
(B): 0.7
Pr<120
(C): L/D>60
(D): all of these
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