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Which mechanism contributed to more effective late-Ming cast iron cannons, improving range?

A)Bridging the thermal expansion gap
B)Lowering viscosity with manganese additions
C)Increasing barrel-hoop weld-joint strength
D)Reducing sulfur buildup at grain boundaries

💡 Explanation

Bridging the thermal expansion gap between inner bore grains and external hoops was key because differential expansion led to cracking and catastrophic failure; therefore, cannons could handle greater pressure, rather than experiencing premature explosive shattering.

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