Engine_2014 : Electricity - 808/2299
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| How can the charge of a lead-acid battery be restored? |
| A) by passing alternating current through the cell |
| B) by passing direct current through the cell backward against the flow of normal discharge current |
| C) by passing a direct current through the cell forward with the flow of normal discharge current |
| D) by adding acid to the electrolyte |
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