十升水为1000kg W吸=cm(t1-t2) =4.2*1000j\(kg*摄氏度)*1000kg*(100摄氏度-20摄氏度) =336000000j W放=pt 又因为W吸=W放 所以W放=336000000j=pt 所以t=w/p=336000000j/1000w=336000s
