ahlam1399
01-24-2018, 09:53 PM
NASA has successfully tested a new shape memory alloy that allows the outer portion of aircraft wings to fold in midair.
أكثر... (http://www.cnn.com/videos/cnnmoney/2018/01/24/nasa-alloy-fold-wings-abc-orig-vstan.cnn)
أكثر... (http://www.cnn.com/videos/cnnmoney/2018/01/24/nasa-alloy-fold-wings-abc-orig-vstan.cnn)