The US aviation regulator has issued a lengthy defence of its safety procedures as criticism mounts over the way in which it certified Boeing’s 737 Max aircraft, the model that has crashed twice in the last six months.
随着各方对波音(Boeing) 737 Max机型的认证方式提出越来越多的批评，美国航空监管机构对其安全程序进行了冗长的辩护；过去6个月里，此型飞机发生了两起坠机事故。
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