रेडियो तरंग के लिये प्रयुक – McqOptions

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1.	रेडियो तरंग के लिये प्रयुक्त वायुमण्डल का स्तर है, ...........।
A.	वर्णमंडल
B.	क्षोभमण्डल
C.	आयनमंडल
D.	समताप मंडल
Answer» D. समताप मंडल

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