多种意思： 1 永久虚拟电路 Permanent Virtual Circuit 2 聚氯乙烯 polyvinyl chloride 3 视频投影机 Projecting Video Camera
默认的是这个。聚氯乙烯。polyvinyl chloride
polyvinyl chloride 聚氯乙稀
It is a noun - polyvinyl chlorid; A polymer of vinyl used instead of rubber in electric cables; polyvinyl resin.
答：,especiallyinamotorvehicle凸轮轴。SOHC指单顶置凸轮轴,比起前任主流OHC,能够更好地再高转速下工作,提高进、排气功率详情>>
答：详情>>
