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← HistoryWhich risk increased in early Chinese crossbows when rapid firing exceeded optimal design?
A)String fraying from friction heating
B)Metal trigger sears yielding plastically✓
C)Wood stock delamination from moisture
D)Bowstring attachment knot slippage
💡 Explanation
Plastic deformation became an issue because exceeding the design limits stressed the trigger sears beyond ultimate tensile strength; thus, this material Yielding plastically was more common, rather than string fraying or wood delaminating due to relatively lower thermal inputs and slower moisture.
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