A valve, having provision for replacing stem packing while the valve is under pressure, has a valve body with a flow passageway through it, a gate that is vertically positioned to open and close the passageway, a stem extending upwardly from the valve body, the lower end being attached to ...
ainvoive,packing list , original certificate (CO or FORM A) Bill of loading 正在翻译,请等待... [translate] aWheat proteins are usually classified according to their solubility. 麦子蛋白质根据他们的可溶性通常被分类。[translate] a“Mike always loves ships. When he was younger good, he said,“...