Which of the following country has become the first to use Drones for national mail service?

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Q: 79 (Current Affairs-DEC/2016)

Which of the following country has become the first to use Drones for national mail service?
Consider the following activities : 1. Spraying pesticides on a crop field. 2. Inspecting the craters of active volcanoes. 3. Collecting breath samples from spouting whales for DNA analysis. Q. At the present level of technology, which of the above activities can be successfully carried out by using drones ? (a) 1 and 2 only (b) 2 and 3 only (c) 1 and 3 only (d) 1, 2 and 3

question_subject: 

History

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0,62,128,69,40,62,19

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{'national mail service': [0, 0, 0, 1], 'drones': [0, 0, 0, 1], 'china': [1, 0, 1, 2], 'england': [15, 0, 7, 12], 'country': [27, 2, 36, 66], 'russia': [0, 0, 1, 1], 'france': [1, 0, 0, 0]}