General Science- Thermos Flask Taral Padartho Ko Lambe Samay Tak Garam Rakhta Hai , Kyonki . . . . . . . . .

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Q.10335: थर्मस फ्लास्क तरल पदार्थो को लम्बे समय तक गरम रखता है , क्योंकि . . . . . . . . .
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