[多项选择]保证电池正常寿命的因素有()。 A. 环境温度 B. 充放电流 C. 放电深度 D. 电池容量的合理配置 E. 定期维护
参考答案:A, B, C, D, E
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第1题: [单项选择]She didn't ring the communication cord immediately because ______. A. she was very much afraid B. there was no point of doing so C. she was too shocked to move D. the ticket collector came in 参考答案:B 答案解析:要点定位题。从文中第六段“After all,what use would it be ringing the cord of the train in which she was traveling