85公里,初步建成了“以中心环线为核心、以若干放射线为延伸、干线支线缆线相结合”的地下综合管廊骨...·
国家标准《厅堂扩声系统模块设计规范》进行局部修订后,自8月1日起实施。修订后的标准主要增加了观众...·
近些年来,中国在多个领域创造了大量的世界之最。这一个个的 “世界首次”“世界第一”深刻地改变了中...·
常泰长江大桥是长江上首座集高速公路、城际铁路、一般公路三种办法于一体的过江通道,仍是世界上最大规...·
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1970-01-01 08:00:00
国家标准《厅堂扩声系统模块设计规范》进行局部修订后,自8月1日起实施。修订后的标准主要增加了观众...
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1970-01-01 08:00:00
近些年来,中国在多个领域创造了大量的世界之最。这一个个的 “世界首次”“世界第一”深刻地改变了中...
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1970-01-01 08:00:00
常泰长江大桥是长江上首座集高速公路、城际铁路、一般公路三种办法于一体的过江通道,仍是世界上最大规...
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1970-01-01 08:00:00
桥梁箱梁分单箱、多箱等。一般内部为空心状,上部两边有翼缘,相似箱子,因此得名。箱梁分为预制箱梁和...
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1970-01-01 08:00:00
此次浇筑的现浇箱梁长90米,梁体为纵向和横向双向预应力系统,截面结构为单箱四室,横向宽度突变,箱...