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单选题
GCU中励磁控制继电器GCR提供励磁电压使发电机工作。对GCR的控制描述较为完整的是：
A
P5头顶板上的发电机电门控制GCR的闭合、脱开
B
GCU保护电路控制GCR的脱开
C
P5头顶板上的发电机电门控制GCR的闭合、脱开，而GCU保护电路控制GCR的脱开
D
P5头顶板上的发电机电门控制GCR的脱开，而GCU保护电路控制GCR的闭合、脱开
答案解析
正确答案：C
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