Q.895 : Flying above oceans is (1)/ one of the challenges of the new (2)/ air-traffic control technology.(3)/ no error (4)

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Q.895 : Flying above oceans is (1)/ one of the challenges of the new (2)/ air-traffic control technology.(3)/ no error (4)
(a) 1
(b) 2
(c) 3
(d) 4

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Answer :1