One ton of the refrigeration is_________________?

A. the refrigeration effect to produce 1 ton of ice at NTP conditions

B. the refrigeration effect to freeze 1 ton of water at 0C into ice at 0C in 24 hours

C. the cooling effect produced by melting 1 ton of ice

D. the refrigeration effect to produce 1 ton of ice in 1 hour time

E. the standard unit used in refrigeration problems

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