波音飞机材料组成 1%1% 3% 4% 2%- 1% 13%1 14%- DAluminium mSteel 747 767 Titanium 81% 80% ☑Composite ■Misc 3% 6% 1% 11% 1% 5% 20% 12%1 7% 757 11% 777 787 10% 70% 78% 50% 15%波音飞机材料组成