研究了硼砂盐浴渗铬和氯系熔盐渗铬.It was investigated that chromizing in borax salt bath and melting hydrochloride.而且浇注温度越高, 铸渗铬合金层越厚.The higher casting temperature, the thicker castchromized alloy layer.研究了铸铁表面铸渗铬合金层形成过程.The forming pro...
By happy coincidence, Robert met Richard and Julia and discovered they were experiencing similar problems.幸运的是，罗伯特碰巧遇到了理查德和朱莉娅，发现原来他们也碰到了类似的问题。The economy is experiencing an upturn.经济正在好转。Many poor households are experie...