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视频图像信号是现代飞机试飞测试的重要内容之一。
Video image signal is one of the important modern flight test subjects.
美国是唯一一个能够制造隐形作战飞机的国家，而俄罗斯仅是另外一个能进行这种飞机试飞的国家。
America is the only nation to produce an operational stealth fighter jet, and Russia is the only other country to even test one.
波音表示，地面振动测试已经于上周在第二架测试飞机- ZA002上完成。
Boeing also confirms that ground vibration testing were concluded last week on the second test aircraft, ZA002.
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