Liushi, across the Oujiang estuary from Wenzhou, accounts for 40% of the country's low-voltage electrical switches.

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To gather venom for commercial purposes, beekeepers place a sheet of glass embedded with low-voltage electrical wires at the hive entrance.

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Discharging the battery too quickly, or with too low voltage, can also cause it to overheat, said University of Dayton professor Raul Ordonez, an aircraft electrical and computer engineer who spent time observing Dreamliner development at Boeing's Seattle headquarters.

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