谁来维护飞机且频率如何？维护是否由原厂授权的服务中心执行？缛。
Who maintains the aircraft and how often is it serviced? Is the maintenance conducted by factory-authorized service centers or not?
谁来维护飞机且频率如何？维护是否由原厂授权的服务中心执行？缛。
Who maintains the aircraft and how often is it serviced? Is the maintenance conducted by factory-authorized service centers or not?
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