基本解釋

英漢例句

Needle valve : It is an important instrument measuring piping system components, mainly cut-off valve and ball valve , its purpose is to open or cut off access by pipeline.
針型閥：是儀表測(cè)量管路系統(tǒng)中重要組成部分，主要有截止閥和球閥，其功用是作開啟或切斷管道通路用。
A new device for measuring run out error of needle valve seat′s cone surface is proposed. The calculating and estimating methods of the error are also described in the paper.
推出了一種新的針閥體座面圓跳動(dòng)誤差測(cè)量裝置，介紹了誤差的計(jì)算與評(píng)定方法。