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单选题
B-737CL当飞机连接上外部直流电源后，对于主电瓶的处理：
A
必须拆下
B
必须保持连接状态
C
允许保持连接状态或者拆下
D
必须先拆下，当接上外部直流电源后又必须重新安装好
答案解析
正确答案：C
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