单项选择题
Since heat will not flow freely from a body at a （） temperature to another at a （） temperature, it is necessary to expend mechanical work, heat, or electrical energy from an external source to achieve refrigeration.
A.lower；higher
B.shallower；deeper
C.larger；smaller
D.higher；lower
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相关考题
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单项选择题
In the process of （）, liquid changes into gas.
A.evaporation
B.frosting
C.condensing
D.compressing -
单项选择题
If the capacity of the refrigeration compressor is too large, the saturation temperature will （）.
A.rise
B.fall
C.be maintained constant
D.None of the above -
单项选择题
If the capacity of the refrigeration compressor is too small, the excess vapor will accumulate in the evaporator, causing the pressure to （）.
A.rise
B.fall
C.be maintained constant
D.None of the above is true
