Other important African export commodities are iron ore and timber, followed by manganese, cobalt, copper and chromium.
其他重要的非洲出口商品是铁矿石和木材，其次还有锰、钴、铜和铬。
Alloy steel owe their properties to the presence of one or more elements other than carbon, namely nickel, chromium, manganese, molybdenum, tungsten, silicon, vanadium, and copper.
合金钢的性质取决于其所含有的除碳以外的一种或多种元素，如镍、铬、锰、钼、钨、硅、钒和铜。
Faced with a challenge from Mr Simon, Mr Ehrlich selected five metals-copper, chromium, nickel, tin and tungsten-whose prices he thought would rise in real terms over the following ten years.
面对西蒙的挑战，埃尔利希选择了铜，铬，镍，锡，和钨这5种金属，他认为这些金属在扣除物价因素后，价格在接下来的十年里会增长。
Minerals are chromium, copper, nickel, iron, asphalt, coal and petroleum.
矿藏有铬、铜、镍铁、沥青、煤、石油等。
For example steel base plated copper, nickel, chromium plating, low layer again tin bronze chrome, multi-layer nickel chrome plating nickel ferroalloy, chrome, and so on.
例如钢基上镀铜、镍层再镀铬、低锡青铜上镀铬、多层镍上镀铬、镍铁合金镀层上镀铬等等。
Special treatment is recommended to activate beryllium copper surface before chromium plating. And special steps which differ from conventional chromium plating on steel parts are to be taken.
在铍青铜合金上电镀铝，需在镀铝前作特殊的表面活化处理，镀铬时也有不同于钢铁件镀铬的操作方法。
Established a method determining the content of trace elements copper, zinc, manganese, lead, chromium, calcium, nickel of haematitum and red ore by FAAS.
建立火焰原子吸收光谱法用于测定矿物药赭石和红矿中微量元素钙、铜、锌、锰、镍、铬、铅的含量的方法。
The result show that zinc, copper, iron, chromium, mangan, nickel, cadmium, calcium content in 6 biologicals are the most rich in ant factor injection liquid.
结果表明，6种生物制剂中锌、铜、铁、铬、锰、镍、镉、钙均以蚂蚁因子含量最高，钾含量则以转移因子、 胸腺肽较丰富；
Different metals are separated from the electroplating sludge by roasting and copper, nickel and chromium were recovered with suitable methods such as removing iron by sodium jarosite precipitation.
该工艺采用焙烧法将污泥中的金属组分同类分离，并结合黄钠铁矾沉淀法去除杂质铁等工艺对铜、镍、铬进行了回收利用。
The researchers found an "association" between various types of lung cancer and releases of zinc, chromium and copper.
研究人员发现，各类肺癌与锌、铬和铜的排放之间有一层“关系”。
In the early days copper was normally followed by a relatively thin bright nickel layer with conventional chromium topcoat.
早期，涂覆铜层之后，再涂一薄层光亮镍，然后传统的铬层位于最外层。
The processes of application research of rare earth elements as additives on zinc, chromium, nickel, tin, iron, copper plating were described.
简述了稀土添加剂在国内镀锌、铬、镍、锡、铁、铜工艺上的应用研究进展。
The relation. between the con- verting rate of chromium and roasting temperature , the amount of soda , the amount of back slag - copper oxide are also studied.
研究了铬转化率与焙烧温度、配碱量、返渣氧化铜的量等条件的关系。
The effect of copper on low boron low chromium nickel based brazing alloy was studied by experiments.
本文研究了铜对低硼、低铬镍基钎料工艺性能的影响。
Several trace elements proved to have antioxidant properties, including chromium, zinc, iron, Magnesium, vanadium and copper.
多种微量元素被证明具有抗氧化作用，包括：铬、锌、铁、镁、钒、铜。
The effects of catalyst preparation and hydrogenation conditions on the activity of copper-chromium oxide catalysts for selective hydrogenation of soybean oil was investigated.
通过铜铬氧化物催化剂用于豆油的选择氢化，研究了制备方法及氢化条件对催化剂活性的影响。
The press quench 6020 alloy of the present invention contains silicon, magnesium, copper, iron, manganese, chromium, and tin.
本发明的模压淬火6020合金含有硅、镁、铜、铁、锰、铬和锡。
Arsenic and chromium based water-borne preservatives, especially CCA (chromated copper arsenate), have been partly replaced by some copper based preservatives.
以铬化砷酸铜(CCA)为代表的水载型防腐剂，逐渐被其他主要有效成分为铜的水载型防腐剂取代，这类防腐剂中的。
The metal can be aluminum, copper, manganese, titanium, chromium, lead, etc.
该金属可以是铝、铜、锰、钛、铬、铅等。
Tis kind of machine adopts import grade SCR module control system. The contact of electrode holder is made of high chromium copper and the force of electrode holder can be adjusted freely.
该机器采用进口可控硅模块控制，焊钳夹力大小可随意调节，而且焊钳触点为高铬铜。
The method for determination of aluminum, copper, iron, phosphorus and silicon in metallic chromium has been studied with a direct-reading inductively coupled plasma emission spectrometer.
阐述了用全谱直读型电感耦合等离子体发射光谱仪测定金属铬中铝、铜、铁、磷、硅元素的测试方法的研究。
Several solution composition for cleaning, zinc dipping and subsequent copper, nickel, chromium plating are given.
文章中给出了若干清洗、浸镀锌以及后来镀铜、镍、铬加工液的配方。
However there were no significant differences in serum copper and chromium changes.
血清铜和铬值改变无统计学意义。
Ltd, etc. yearly output is 300ten thousand ton of steel brand, palte, seamless steel tubes, high frequency welded pipe and nickel, gold, copper, cobait, chromium iron etc.
年产钢带、无缝钢管、高频焊管及镍、金、铜、钴、铬铁等金属产品300万吨。
The abrasion wear mechanism of Mn copper-nickel alloy matrix-cast chromium carbide composite was studied.
研究了真空熔铸法制备的锰白铜基铸造碳化铬复合材料的二体磨料磨损机理。
The results showed that boron has a notable influence on the mechanical properties of high chromium cast iron at as-cast and molybdenum and copper has little influence on the mechanical properties.
研究结果表明：硼对铸态高铬铸铁力学性能有显著影响，而钼和铜对其性能影响不大。
Twinlab Brewers Yeast also contains naturally occurring amounts of vitamin B12, calcium, phosphorus, potassium, magnesium, copper, iron, zinc, manganese and chromium.
天莱啤酒酵母也含有天然的维生素b12，钙，磷，钾，镁，铜，铁，锌，锰，铬等元素。
Twinlab Brewers Yeast also contains naturally occurring amounts of vitamin B12, calcium, phosphorus, potassium, magnesium, copper, iron, zinc, manganese and chromium.
天莱啤酒酵母也含有天然的维生素b12，钙，磷，钾，镁，铜，铁，锌，锰，铬等元素。
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