tube spacing管: pipe; tube节距: pitch; step管节: pepe joint; pipe joint; pipe junction; pipe union; tube coupling; union coupling; vessel members节距: pitch; step◇节距规 pitchometer; 节距检验器 pitch tester管节套: barrel extension下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:管节距，即可在微信中查询翻译
