Engine_2014 : Electricity - 1058/2299
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| In general, why are nickel-cadmium storage batteries superior to lead-acid batteries? |
| A) they put out higher voltages and require no maintenance |
| B) they can remain idle and keep a full charge for a long time |
| C) they need fewer cells in series and use less mounting space |
| D) they are less costly to replace |
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