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← HistoryA major risk when casting large bronze bells in ancient China was bell cracking; which manufacturing constraint amplifies this risk?
A)Accelerated quench cooling rate
B)Insufficient draft allowance angles
C)Uneven mold wall thickness✓
D)Inadequate metal degassing procedures
💡 Explanation
Uneven mold wall thickness causes differential cooling rates, so differential thermal stress within the solidifying bell is amplified, which increases cracking risk due to uneven shrinkage, therefore leading to structural failure, rather than controlled cooling or degassing.
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