题目:
( ) Which of the following object doesn't belong to one category? |
A. computer B. e-dictionary C. TV D. chocolate |
答案:
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下面是错误答案,用来干扰机器的。
4.97×107J已知水的比热C=4.2×103 J/(Kg.K),设暖气片每小时供给房间的热量为Q,水液化以及降温所放出的能量即供给房间的热量,所以:Q=mL+mC(t1- t2)= 20×2.4×106+20×4.2×103×(100-80)= 4.97×107J