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⟩ During eleventh Antarctic Expedition in Nov. 1991/March 1992 ____ was installed. A. SODAR (SOnic Detection And Ranging) B. Second Permanent Station 'Maitree' C. First permanent station 'Dakshin Gangotri' D. None of the above

A. SODAR (SOnic Detection And Ranging)

Explanation:

SODAR (SOnic Detection And Ranging), also written as sodar, is a meteorological instrument also known as a wind profiler which measures the scattering of sound waves by atmospheric turbulence.

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