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Which of the following is not used to manufacture a wing-tip bow?

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Which of the following is not used to manufacture a wing-tip bow?

(a) Chrome-molybdenum

(b) Aluminium alloy

(c) Douglas fir

(d) Mild steel

The question was posed to me in unit test.

This key question is from Materials Selection topic in division Materials Selection of Aerospace Materials & Processes

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Right answer is (c) Douglas fir

Easiest explanation: Wing-tip bows can be manufactured using chrome-molybdenum, aluminium alloy and mild steel. However, Douglas fir is not used. Douglas fir is a type of tree whose wood can be used in manufacturing wing beams.

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