短語詞組短語bottom articulated joint 底部鉸接縫bottom induced joint 誘導(dǎo)底縫upstream bottom -joint 上遊底縫Bottom Upset Joint 下耑外螺紋連接bottom chord joint 下弦接頭bottom -joint 誘導(dǎo)縫bottom tool joint 下方接頭bottom m joint 水平節(jié)理oblique grinding bottom joint 斜對(duì)接接頭 返回 bottom joint