（EMB145）关于backup battery，下面哪个说法正确？（）A、备用电瓶会被加热B、备用电瓶供电给备用essential DC busC、两个答案都正确
（EMB145）关于backup battery，下面哪个说法正确？（）
- A、备用电瓶会被加热
- B、备用电瓶供电给备用essential DC bus
- C、两个答案都正确
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