Engine : Electricity - 710/1386
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| Why are nickel-cadmium batteries superior to lead-acid batteries for standby service? |
| A) they are able to hold their charge for long periods of time without recharging |
| B) they need fewer cells connected in series for the same voltage and require less mounting space |
| C) the have higher output voltages for the same number of cells and require no maintenance |
| D) they have a lower cost of acquisition |
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