短語詞組短語beam bottom curve 梁底曲線straight beam on curve 曲線直梁Beam Curve Offset 光束曲線偏移Curve beam 曲線梁beam moment -deflection curve 彎矩curve beam bridge 曲線梁橋curve beam in space 空間曲梁flexible curve beam 柔性曲線梁curve beam ribbed bridge 曲線肋梁橋 返回 beam curve