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

57. - 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
57. Why was "dissymmetry" important to the early pioneers of helicopter flight? A. It allowed helicopters to lift from the ground. B. It was an effect that caused helicopter to crash. C. It equalized lift on each side of the central shaft. D. It allowed the rotor blade angles to be altered.