短语词组短语metal pipe -wall 金属管壁pipe -wall thickness 管壁厚度Pipe -wall corrosion 壁厚腐蚀X -ray pipe-wall gauge 射线管壁测量仪;射线管壁厚度差测量仪steel pipe pilecompound soil -nailing wall 钢管桩复合土钉墙casing -pipe wall 套管壁 返回 pipe wall