0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA">5kg 的水起初与温度为 宋体;color:#333333;mso-font-kerning:0pt;mso-ansi-language:EN-US;mso-fareast-language: ZH-CN;mso-bidi-language:AR-SA">295K 的大气处于热平衡状态。用一制冷机在这 宋体;color:#333333;mso-font-kerning:0pt;mso-ansi-language:EN-US;mso-fareast-language: ZH-CN;mso-bidi-language:AR-SA">5kg 水与大气之间工作,使水定压冷却到 宋体;color:#333333;mso-font-kerning:0pt;mso-ansi-language:EN-US;mso-fareast-language: ZH-CN;mso-bidi-language:AR-SA">280K ,所需最小功是( )。
A.
mso-font-kerning:0pt">8156J mso-font-kerning:0pt">
B.
0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA">8256J
C.
0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA">8456J
D.
mso-font-kerning:0pt">8056J mso-font-kerning:0pt">