pipeline bridge upper structure的意思|示意

管桥上部结构 4.90 斜拉索管道跨越obliquely-cable stayed pipeline aerial crossing 3.2.4.91管桥上部结构pipeline bridge upper structure 3.2.4.92 管桥下部结构pipeline bridge understructure ..

管桥上部构造 3.2.4.91管桥上部构造pipeline bridge upper structure 3.2.4.92 管桥下部构造pipeline bridge understructure ..