热泵是一种利用高位能（如电能）使热量从低位热源流向高位热源的节能装置。
参考答案：对
I didn't buy the dictionary yesterday ______ my aunt would give me one. [ ]
A. until
B. because
C. if
D. before
情节最能打动人心的两个地方是什么？（亚里士多德）
