एल्मर ए। स्पेरी ने क्या आव� – McqOptions

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1.	एल्मर ए। स्पेरी ने क्या आविष्कार किया था?
A.	हीड्रोप्लैन
B.	हाइड्रोलिक टरबाइन
C.	चुम्बकीय परकार
D.	दिक्सूचक
Answer» E.

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