थर्मस फ्लास्क के आविष्कार� – McqOptions

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1.	थर्मस फ्लास्क के आविष्कारक है
A.	न्यूटन
B.	स्टीफन
C.	डिवार
D.	किरचाफ
Answer» D. किरचाफ

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