double stub 中文意思是什麼
double stub
解釋
雙截線-
A new type of metal seal structure with double stub shaft moving disk butterfly valve was presented. the structure, characteristic and work principle of it was studied
摘要提出了一種金屬硬密封蝶閥新結構雙閥桿蝶板移動式金屬硬密封蝶閥,討論了此閥的結構、工作原理及特點。 -
Non - soldering compression fittings with cutting ring - double ended stud ends with parallel thread for stub ends type a
帶切割環的非釬焊壓合接頭.鈍端a型帶平行螺紋的雙鈍
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