About قطار
حمل بارهای فلهای بیشتر از ۳۲ کیلومتر میتواند مقرون به صرفه باشد.Pcs are used by organizations to draw, plan and do Preliminary simulations from the aircraft. Small models and mockups of all or selected parts of the plane are then analyzed in wind tunnels to verify its aerodynamics.بعضا