In this paper,through the adding of minute rare earth oxides La2O3 and CeO2 in the electrode covering,we study their effects on high temperature oxidation and corrosion resistance of the weld metal in the air and sulphureous gas.

本文通過(guò)在焊條藥皮中分別添加微量稀土氧化物L(fēng)a2O3及CeO2大香煮伊区一区二区三区，研究其對(duì)焊條熔敷金屬在空氣中和含硫氣氛中抗高溫氧化及腐蝕性能的影響中日韩午夜高青视频在线观看。

In combination with the situation of processing high sulphureous crude oil in recent years, units and equipments occurred easily that corrosion in the process of production were analyzed. The comprehensive measures adopted from four fields of controlling hydrogen su...

結(jié)合近年加工高硫原油的情況无码日韩人妻视频，分析了煉油生產(chǎn)中易發(fā)生該種腐蝕的裝置和設(shè)備亚洲综合操逼网，并提出了從控制介質(zhì)中硫化氫濃度色妞一区二区三区视频在线、設(shè)備材料的質(zhì)量亚洲人人一区二区三区、設(shè)備制造安裝工藝以及使用管理等四個(gè)方面綜合采取措施国产精品久久久久电影院87，預(yù)防濕硫化氫應(yīng)力腐蝕的產(chǎn)生。

In addition, the study also indicates that there are differences in increasing grain yield and improving yield characteristics of the two cultivars among the different sulphureous fertilizer application.

比較硫肥不同處理對(duì)兩種小麥品種光合生理特性及產(chǎn)量的調(diào)控作用以及投入成本來(lái)看2828一区二区欧美，在目前高產(chǎn)田養(yǎng)分供應(yīng)條件下特级女同一级毛片，兩品種均以基施S120 kg/hm2效果相對(duì)較優(yōu)。

This paper aimed at present status that most researches assembled in chemical products, adopted different determine methods, represented the transformation characteristic of nitrogen among water and soil of the sulphureous urea, confirmed the nutrient release speed, found out the optimum determine method in agricultural production application.

針對(duì)目前對(duì)緩釋肥料釋放特性的研究集中在化工制作領(lǐng)域這一現(xiàn)狀美日韩一区二区毛片，采用不同的測(cè)定方法综合一区,二区，闡明含硫尿素中的養(yǎng)分氮在水及土壤中的轉(zhuǎn)化特點(diǎn)，確定養(yǎng)分的釋放速率九九久久精品无码免费一区，以求找出適合農(nóng)業(yè)生產(chǎn)應(yīng)用的方法国产原创精品在线观看。