短語詞組短語dryseal straight pipe thread 氣密直管螺紋straight pipe thread 直管螺紋;直管羅紋;圓筒形管螺紋straight internal thread 直內(nèi)螺紋straight screw thread connection 直螺紋連接connective technology of equal -strength straight-thread 等強度直螺紋連接技術(shù)straight thread plug 直螺紋螺塞peel rolled straight thread 剝肋滾壓直螺紋straight thread conjunction 直螺紋連接uniform strength straight thread 等強直螺紋 返回 straight thread