-- card: 41804 from stack: in
-- bmap block id: 0
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-- background id: 2707
-- name: #174
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on openCard
  global group,rightone
  put 13 into group
  put "D" into rightone
  pass openCard
end openCard



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Question #13

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2C-3.6 What type of radio wave propagation makes it possible for amateur stations to communicate long distances?

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Direct-inductive propagation.

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Knife-edge diffraction.

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Ground-wave propagation.

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Sky-wave propagation.

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Correct answer is D