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【单选题】
荷电状态(SOC),这一参数是在电动汽车使用中十分关键却不易获取的数据。它的含义是A.
表示放电程度的一种量度，它是放电容量与总放电容量的百分比
B.
电池在一定放电制度下，单位时间内输出的能量
C.
是指剩余电量与额定容量或实际容量的比例
D.
是指一定的放电电流放完额定容量所需的时间
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