题目:蓄电池车辆紧急断电开关的作用是 The function of the emergency power-off switch for battery vehicles is
A. 故障时切断主电路Cut off the main circuit in case of malfunction
B. 故障时切断控制电路Cut off the control circuit in case of malfunction
C. 故障时切断主电路及控制电路Cut off the main circuit and control circuit in case of malfunction
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