Symmetrical diynes were synthesized by ligand-free copper-catalyzed homocoupling reaction.
通过无配体的铜催化均偶联反应合成对称二炔。
The thread gage G, lead-free copper fittings;
欧规G螺纹、无铅铜连接件；
Effects of re on technological processing and product properties of oxygen free copper rod in up-drawing casting were studied.
研究了微量稀土对上引法无氧铜杆生产工艺及产品性能的影响。
Technological method of control oxygen content for oxygen-free copper sheets in production process is introduced. There is reference value.
介绍了电真空行业用无氧铜板的生产过程中控制氧含量的工艺方法，以供同类厂家参考。
The nitrogen Deoxo Vessel contains a fixed bed of free copper catalyst which removes oxygen from the nitrogen stream by oxidation of copper to copper oxides.
氮气脱氧罐中装有一个游离铜催化剂的固定床，通过将铜氧化成氧化铜把氧气从氮气中脱除。
Production and sale of main products have all kinds of PVC particles, high-grade oxygen-free copper wire, tinned wire, and a variety of wire and cable products.
公司生产及销售的产品主要有各种聚氯乙烯胶粒，高档无氧铜丝、镀锡丝，以及各类电线电缆产品。
The progress in the study of cyanide-free copper electroplating on steel matrix is introduced according to different valences of copper in the deposition process.
按照沉积过程中铜的价态的不同对在钢铁基体上无氰碱性镀铜的研究进展进行了说明。
PV Ribbon, TUI oxygen-free copper belt high purity 99.99%, smooth, brilliant, cleaning, plated by dipping with tin and lead with different chemicals compositions.
涂锡铜带是由纯度达99.99%的TUI无氧铜材制成，产品表面光滑、平整，色泽均匀。在铜线表面涂敷了锡和铅以及其他化合物。
This article describes the process of producing oxygen-free copper and control of its technical parameters. Solutions are given out for problems exposed in the process of prodution.
本文介绍了无氧铜生产工艺，探讨了其技术条件控制，对生产中暴露出来的问题提出了解决办法。
The plasma sprayed tungsten coatings were prepared on oxygen free copper substrates, which are to be used as the plasma-facing materials of the divergent components in fusion reactors.
在无氧铜的基体上制备了等离子喷涂钨基涂层以应用于核聚变反应堆中偏滤器部件的面向等离子体材料。比较了不同过渡层对等离子喷涂钨基涂层结合强度的影响。
Symmetrical diynes were synthesized by ligand-free copper-catalyzed homocoupling reaction of 1,1-dibromo-1- alkenes using a DBU/DMSO system at room temperature in good to excellent yields.
本文以1，1-二溴-1-烯烃为原料，铜作为催化剂，不添加任何配体，在有机碱DBU的作用下，在DMSO溶剂中，室温下合成对称二炔，得到中等到优秀的产率。
Older homes may have lead pipes, but even new plumbing that's lead free can still contain lead in brass fitting or faucets or in copper pipes with soldered joints.
旧的家庭用的是铅管，但是即使是新的无铅水管装置在焊接接头的铜管件或水龙头或铜管中也含有铅。
On $3.75 a pound copper my worksheets show Freeport's free cash flow running at $10 a share.
75美元一磅的铜价在财务报表上反映为Freeport每股十元的自由现金流。
The green "metal free tool" sign indicates that this machine is used in a part of the process prior to the addition of copper circuits.
绿色的“非金属添加工具（metalfreetool）”标志意味着硅晶圆必须得经过这台机器的处理以后，才能去添加铜质电路。
These compounds are soluble in water, and contains the hemiacetal hydroxyl free, so in alkaline solution can reduce silver ions and copper ions.
这些化合物能溶于水，并含有游离的半缩醛羟基，所以在碱溶液中能还原银离子和铜离子。
Iron and copper increase oxidative stress (free radical damage), which is a major problem in CFIDS.
增加铁和铜的氧化应激(自由基损伤)，这是一个重大问题在CFIDS。
A micromachined condenser microphone with a free floating sensing diaphragm and a perforated thick copper backplate is presented.
提出了一种具有自由悬浮敏感膜和带孔铜底板的硅微机械电容式麦克风。
Multiphase equilibrium mathematical model for the copper flash smelting process is established based on the Gibbs principle of minimum free energy.
基于吉布斯最小自由能原理，建立了铜闪速熔炼过程的多相平衡数学模型。
The maraging alloys series containing copper but cobalt free have been investigated.
对含铜无钴马氏体时效合金系列进行了研究。
The free electrons move into the saltwater, then into the clean copper plate, into the wire, through the meter, and back to the cuprous oxide plate.
自由电子进入盐水，然后把干净的铜板，到线，通过米，并回到氧化亚铜板。
After sealed by sealing rope, it is essentially solid-free with residue between dummy bar head and mould copper plate, no damage to the copper plate and easy to clean.
密封绳在开浇后与引锭头、铜板无粘结残留物，对铜板无损伤，易于清理。
Copper-containing enzymes play important roles in iron and catecholamine metabolism, free radical scavenging, and in the synthesis of hemoglobin, elastin and collagen.
含铜的酶在铁和儿茶酚胺的代谢、自由基清除、合成血红蛋白、弹性蛋白和胶原蛋白中发挥重要作用。
Copper-containing enzymes play important roles in iron and catecholamine metabolism, free radical scavenging, and in the synthesis of hemoglobin, elastin and collagen.
含铜的酶在铁和儿茶酚胺的代谢、自由基清除、合成血红蛋白、弹性蛋白和胶原蛋白中发挥重要作用。
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