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中科院宣布国产航发获重大突破，C919什么时候能正式交付？
美国一度威胁要断供C919航天发动机，中科院却宣布了国产航发获得重大突破的好消息，对此有网友评论，为了波音，美国又打算发动制裁，却被中科院狠狠打脸，特朗普就只有这点手段？
思远防务君1557/2388
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