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| M: +1.34/-0.25

A liquid remains hot or cold for a long time in thermos flask because there is no loss or gain of heat by which of the following?

????? ??????? ??? ?? ??? ???? ??? ?? ???? ?? ???? ???? ?? ??????? ?????????? ??? ?? ????? ?????? ????? ?? ??? ?????? ?? ??? ???? ???? ???

[UPPSC 2019 GS P1]
A
B
C
D
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