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The printed circuit assembly is IR or convection reflowed at a temperature between approximately 280 and 290 degrees C, and maintains solder connection integrity when the printed circuit assembly (36) is later incorporated into a second printed circuit assembly using a standard tin-lead solder system.

该印刷电路组件在约280―290℃的温度下通过IR或对流加热而发生回流，并且当该印刷电路组件（36）随后通过标准的锡―铅焊料系被安装至第二印刷电路板时维持焊料连接整体性。

In order to reveal the reasons of forming pore in hydroxyl terminated polybutadiene/ammonium dinitramide/ammonium perchlorate/aluminium (HTPB/ADN/AP/Al) composite propellants, a series of propellant samples containing ADN and triethanolamine, triethanolamine trifluoroboron complex (T-313), tris(2-methylaziridinyl)phosphine oxide, isophthaloyl-bis-(2-methylaziridine)(HX-752) were prepared, and the components of reacting with ADN and forming pore were confirmed,and the reaction mechanism was analyzed by DSC/TG-IR/MS.

为揭示HTPB/ADN/AP/Al推进剂产生气孔的原因，制备了一系列含ADN和TEA、T-313、MAPO、HX-752等键合剂的推进剂样品，试验确定与ADN反应产生气孔的组分，并通过DSC/TG-IR/MS联用仪分析了产生气孔的反应机理。

Their extraction properties have been studied by metal picrates liquid-liquid extraction and the results show:By using three thio-heterocyclic compounds, twelve novel derivatives of thioalkoxycalix[4]arenes on the lower rim have been synthesized and structurally characterized by 1H NMR、13C NMR、IR and MS.

本文采用三种巯基杂环化合物对杯芳烃下沿进行修饰，得到了下沿含有杂环硫烷氧基的杯芳烃系类系列衍生物，并利用~1H NMR、~(13)C NMR、IR和MS对所合成的十二个未见文献报道的新化合物进行了结构表征。

Analyses of spectroscopic and crystal structural data of iridium complexesIr(PR3)Cl and the Vaska's complex reveal that NHC ligands and phosphines have a similar donating ability toward Ir metal center.

并且从光谱分析及晶体结构数据发现[Ir(PR3)Cl]的错合物与Vaska's 错合物相当类似。因此，我们推论其含氮杂环碳烯与膦化物在ㄧ价铱金属上有相似的配位能力。

Various time of permed hair which storage in air were treated by NBD-Cl, and then, the hair surface was investigated with FT-IR.

本文对冷烫后空气中放置不同时间的发样以NBD-Cl溶液处理，头发表面的红外光谱以ATR-FT-IR表征。

New tussah silk fibroin films with nano-CaCO3 were prepared. The composite films were characterized by SEM, DSC, TG, XRD and IR.

制备了一种含有纳米CaCO3的新型柞蚕丝素蛋白膜，通过SEM、DSC、TG、XRD和IR研究了纳米CaCO3的加入对这种丝素蛋白膜性能的影响。

The modified products were analyzed by FT-IR. Softening point, solubility in solvent and n-heptane tolerance were also studied.

对改性产品进行了GPC、FT-IR的表征分析及其软化点、脂肪烃溶解性和溶剂溶解性能等的研究。

The modified product was analyzed by FT-IR and GPC,and softening point,solubility in solvent and n-heptane tolerance were also studied.

对改性产品进行了GPC、FT-IR的表征分析及其软化点、庚烷容纳度和溶剂溶解性能等的研究。

ATR-IR showed that there exist two types of curing mechanisms for DC, self-oxidation at surface layer, and typical free-radical polymerization in the bulk.

ATR-IR研究表明在DC中存在两种固化机理：表层是自动氧化聚合机理进行固化反应，而底层是普通的自由基加成反应。

ATR-IR showed that there exist two types of curing mechanisms for the coatings, self-oxidation at surface layer, and typical free-radical polymerization in the bulk.

ATR-IR结果表明AUPE/VE体系中空气固化时其表层是发生自动氧化反应，而底层是普通的自由基加成反应。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。