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为了保持肉类贮藏室内温度在-15℃，必须从贮藏室输出50kw的热流量，用一台以R134a为的制冷循环机组进行此项工作，该机组的压缩机绝热效率为0.95，环境介质的温度平均为20℃。求：该机组循环的制冷系数、最小功率和循环的流量(如图所示)。已知知: ，且 t/℃ p s /kPa h'/(kJ/kg) h'/(kJ/kg) s'/[kJ/(kg·K)] s'/[kJ/(kg·K)] -15 164.0 180.1 389.6 0.925 1.737 20 572.1 227.4 409.8 1.096 1.718
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【单选题】SQ3R A Proven method for effective textbook reading is the SQ3R method developed by Francis Robinson. The first step is to survey (the S step) the chapter by reading the title, introduction, section h...
A.
needs to be proven
B.
leaves much to be desired
C.
turns out to be practicable
D.
cannot be used by every reader
【单选题】A proven method for effective textbook reading is the SQ3R method developed by Francis Robinson. The first step is to survey (the S step) the chapter by reading the title, introduction, section headin...
A.
needs to be proven
B.
leaves much to he desired
C.
turns out to be practicable
D.
cannot be used by every reader
【简答题】______ is a method of rapidly moving the eyes over a text with the purpose of getting the main idea or a general overview of its content. 2. It can help you get the ______, the ______ of the reading m...
【简答题】A proven method for effective textbook reading is the SQ3R method developed by Francis Robinson. The first is to survey (the S step) the chapter by reading the title, introduction, section headings, s...
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A.
正确
B.
错误
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