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← HistoryWhich risk increased for Inca rope suspension bridges when moisture content of the plant fiber reached its hygroscopic limit?
A)Material tensile strength degraded rapidly✓
B)Anchorage points experienced thermal expansion
C)Decking planks induced resonant vibration
D)Abutments suffered from accelerated erosion
💡 Explanation
When plant fibers reach their hygroscopic limit, the internal hydrogen bonding weakens due to water molecules disrupting fiber cohesion (hygroscopic decay); because tensile strength diminishes, critical ropes were prone to snapping; therefore fiber integrity dictated duration, rather than alternatives like pure load.
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