WHY WAS "DISSYMMETRY" IMPORTANT TO THE EARLY PIONEERS OF...

4. - File thứ 1: De va dap an thi thu lan 2, Anh
Tiếng Anh File thứ 1: De va dap an thi thu lan 2, Anh
4. Why was "dissymmetry" important to the early pioneers of helicopter flight? A. It allowed the rotor blade angles to be altered. B. It equalized lift on each side of the central shaft. C. It allowed helicopters to lift from the ground. D. It was an effect that caused helicopter to crash.