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A wing spar consists of ..
  • A
    frames and webs.
  • B
    ribs and frames.
  • C
    a web and girders.
  • D
    ribs and stiffeners.

Refer to the figure.

A wing spar consists of a web and flanges as seen in the annex. The whole spar is sometimes also called a girder. This does make the answer “a web and girders” the best option. Because there are definitely no frames or ribs in a spar.

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