单选：目前波音对结构修理按照损伤容限分类定义（）。A．A类修理：永久性修理，按照MPD要求检查，没有额外的工作要求B．B类修理：永久性修理，需要按

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目前波音对结构修理按照损伤容限分类定义（）。
A．A类修理：永久性修理，按照MPD要求检查，没有额外的工作要求
B．B类修理：永久性修理，需要按照指定的门槛和重复间隔进行补充检查
C．C类修理：限时性修理，需要按照指定的门槛和重复间隔进行补充检查，需要按照指明的限定时限换件或纠正
D．以上说法均正确

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