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.<br>A:lower；higher<br>B:shallower；deeper<br>C:larger；smaller<br>D:higher；lower

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

出自：海船船员证

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