求翻译：主梁为主要承重构件，受力特点为主梁受弯。主要材料为钢筋混凝土、预应力混凝土，多用于中小跨径桥梁。简支梁桥合理最大跨径约20米，悬臂梁桥与连续梁桥合宜的最大跨径约60-70米。是什么意思？

The main beam as the main load-bearing components, the mechanical characteristics of the main beam flexural. The main material is a reinforced concrete, prestressed concrete, and more for small and medium-span bridge. Simple Beam Bridge reasonable span of about 20 m, the cantilever bridge with conti

Main frame is the main load bearing components, mainly characterized by the force of bending beam. primary material for reinforced concrete, prestressed concrete, and more for small and medium-sized cross-track bridge. Charpy bridge reasonable maximum cross-trail about 20 meters, and cantilever beam

The king post for the main carrier, the stress characteristic is bent for the king post.The main material for the reinforced concrete, the prestressed concrete, uses in hitting the small span bridge.Simple support beam bridge reasonable maximum span approximately 20 meters, bracket beam bridge and c

As the main load bearing members of main girder, force characteristic beams. Main materials for reinforced concrete, prestressed concrete, used on short and medium span bridges. Reasonable maximum span simply-supported girder bridge of about 20 meters, cantilever bridge with the desirable maximum sp

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