[单选题]
A jet plane flying 6b u3(tc-twl q500sp4;vw7evj;+7i15he at*e sz b;uvvb m/s experiences an acceleration of 4g when pulling out of the dive. What is the radius of curvature of the bjihe +v;bw7e1pse4 v7;v;suta*vz5 loop in which the plane is flying?
