fish-beam鱼腹式梁
fish-belly beam角腹式梁
fish-bellied beam鱼腹式梁
fish-bone beam model鱼脊模型
fish-belly y beam角腹式梁
fish-belied driving beam鱼腹式行车梁
fish-bellied box beam鱼腹式箱梁
fish-belly box beam鱼腹式箱梁
fish-belly continuous box beam鱼腹式连续箱梁