GB/T 37439-2019高速铁路预制后张法预应力混凝土简支梁国家标准
英文:Precast post-tensioned prestressed concrete simply-supported beam of high-speed railway GB/T 37439-2019介绍: 国家标准《高速铁路预...
英文:Precast post-tensioned prestressed concrete simply-supported beam of high-speed railway GB/T 37439-2019介绍: 国家标准《高速铁路预...