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CCA101, (　　)MAYDAY,descend to and maintain 3900 meters initially due traffic. 管制员确认航空器驾驶员紧急情况或遇险

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正确答案：A （备注：此答案有误）

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CCA101, (　　)MAYDAY,descend to and maintain 3900 meters initially due traffic. 管制员确认航空器驾驶员紧急情况或遇险

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