التحقق البشري
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علوم
Lift-induced vortices (also called wingtip or trailing vortices) are evidenced by colored smoke on the threshold of a runway, during a demonstration flight run by the German DLR with its ATTAS aircraft.
من فضلك قم بتسجيل الدخول أو التسجيل من أجل نشر تعليق
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