SP welding

SP welding welding是什么意思 butt welding SP. SP. 英语翻译Like at most startups,employees often wear multiple hats.Engineers,including Musk,work in an office-free open cubicle layout less than a minute's walk from where technicians are building rocket engines and machines are welding together sp welding generator是什么意思 Soldering/Welding是什么意思 welding nipples是什么意思 no welding什么意思 tape welding是什么意思 INCONEL WELDING ELECTRODE 182 welding qualification是什么意思 micro-welding什么意思 beam welding 要怎么翻译? sp.gr. BB,SP, sp是什么意思