单选题
1分
Since heat will not flow freely from a body at a _____ temperature to another at a _____temperatuer,...
Since heat will not flow freely from a body at a _____ temperature to another at a _____temperatuer, it is necessary to expend mechincal work, heat, or electrical energy from an external source to achieve refrigeration.
参考答案: A
参考解析: 由于热不能自由流动，从一个身体在较低的温度，另一个在更高的温度，有必要扩大机械工作，热，或从外部源来实现制冷的电能。
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