【单选题】
根据区管中心业务通告，管制员通知机组转换频率的管制指令应当与其他管制指令( )。___
A. 分开发布
B. 同时发布
C. 无特别要求
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答案
A
解析
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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