单选题
It can be inferred from the passage that, in the course of a heating season, the heating
capacity of h heat pump is greatest When______
A、
heating is least essential
B、
electricity rates are lowest
C、
its compressor runs the fastest
D、
outdoor temperatures hold steady
【正确答案】
A
【答案解析】
第五段第二、四句指出，热泵的制热能力随着室外温度下降而降低。原因是：被压缩的制冷剂容量减少，通过热泵循环传送的热负荷就越少。可见，随着温度升高，加热就没有必要。
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