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

42. - 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
42. Why was "dissymmetry" important to the early pioneers of helicopter flight? A. It allowed helicopters to lift from the ground. B. It equalized lift on each side of the central shaft. C. It allowed the rotor blade angles to be altered. D. It was an effect that caused helicopter to crash.