運20、C919和AG600哪一款大飛機研製難度最大？

運20作為軍用飛機，所需要的技術水平會更高，運20肯定會難一些，可以看下我們之前做的一期運20的視頻節目

{!-- PGC_VIDEO:{"thumb_url": "185a000c2d9d153c86e7", "thumb_height": 360, "group_id": 6392376698028950017, "media_id": 52309123591, "neardup_id": 816521619240494680, "vname": "u3010u8bb2u580221u671fu3011_x264.mp4", "video_size": {"high": {"h": 480, "subjective_score": 2, "w": 640, "file_size": 7529142}, "ultra": {"h": 720, "subjective_score": 1, "w": 960, "file_size": 13426335}, "normal": {"h": 360, "subjective_score": 2, "w": 480, "file_size": 5695737}}, "src_thumb_uri": "18580003c406d8094599", "sp": "toutiao", "update_thumb_type": "1", "vposter": "http://p0.pstatp.com/origin/185a000c2d9d153c86e7", "vid": "fb1a813f738248c089c727d8b52b776f", "thumb_width": 480, "item_id": 6392376698028950017, "vu": "fb1a813f738248c089c727d8b52b776f", "duration": 237, "user_id": 52308529636, "md5": "1f83d891579ee3fd2a985e873914f0dd", "thumb_uri": "185a000c2d9d153c86e7", "hash_id": 5939577094965898837} --}