Q吸=cm△t=cm(t1-t2)=4.2X10三次方J/(KG丶℃)X2KGX(100℃-20℃)=

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Q吸=cm△t=cm(t1-t2)=4.2X10三次方J/(KG丶℃)X2KGX(100℃-20℃)=Q吸=cm△t=cm(t1-t2)=4.2X10三次方J/(KG丶℃)X2KGX(100℃-20℃

Q吸=cm△t=cm(t1-t2)=4.2X10三次方J/(KG丶℃)X2KGX(100℃-20℃)=
Q吸=cm△t=cm(t1-t2)=4.2X10三次方J/(KG丶℃)X2KGX(100℃-20℃)=

Q吸=cm△t=cm(t1-t2)=4.2X10三次方J/(KG丶℃)X2KGX(100℃-20℃)=
4.2*10三次方*2*80=6.72*10五次方J=672000J

6.72*10^5