A: Not necessarily. The bending moment and shear force of cantilever beam should be determined according to the load, and the load should be evenly distributed. The bending moment diagram is a quadratic parabola. Under concentrated load, the moment diagram is a straight line. If the cantilever arm length is L and the load Q is uniformly distributed, the bending moment at any point is Q (L-X) 2 */2, the mid-span bending moment is QL 2/8 and the fixed-end bending moment is QL 2/2; If a concentrated force P acts on the mid-span and cantilever ends respectively, the mid-span bending moment is PL/2, and the fixed-end bending moment is1.5pl. The shear diagram should also be determined according to the load, such as uniformly distributed load Q, shear diagram q(L-X), straight line and concentrated load, and shear diagram is rectangular.