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A aquarium( 水族箱) due to the room temperature, the water temperature falls down 25度 to 21度 in one night.
Q1:Tom inserts an 100w aquarium heater into water tank.How long does it take to heat the water back to 25度?
Q2:Would you expect the heating time obtained in Q1(答案) is longer than, equal to or shorter than the actual heating time? Why?
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