A.0.22% B.0.42% C.0.62% D.0.82%
A.碳 B.鐵 C.磷 D.錳
A.跨中正彎矩,支座負彎矩 B.跨中正彎矩,支座正彎矩 C.跨中負彎矩,支座正彎矩 D.跨中負彎矩,支座負彎矩