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Cadence Allegro can be used to make schematic design, PCB and RF/PCB design, high-speed analysis.

应用 Cadence Allegro 软件可以完成手机电子线路设计，PCB 和 RF/PCB 的设计，高数信号仿真。

Solid carbide tungsten fishtail drill is suitable for pcb flexible foil clad laminate,used for target machine drilling,the features of pcb fishtail drill are thin and flexible plate,it's structure and cutting methods are different with normal pcb drill bits.its two main cutting edge is concave and formed 100degree angle,in order to distinguish with PCB drill,named fishtail drill.fishtail drill cuts beginning of circular drill.concave along the main cutting edge to cut,chip is just two much fine filament.cuttingis falling off naturally,in order to be processed without burrformation by pcb surface.

整体硬质合金鱼尾钻适合印制电路板行业加工挠性覆箔板，为打靶机钻孔用。鱼尾钻所加工的印制电路板特性是薄板、带柔性、这样就决定了它的结构和切削方式与一般PCB钻不一样，它的两主切削刃是内凹的，两主切削刃形成100度的夹角，为了与PCB钻区别，就叫它鱼尾名。鱼尾钻切削时从我圆处钻尖开始，沿着内凹的主切削刃切削，切屑只是两条极细丝状切削，整个切削自然剥落，从而被加工印制板表面平整无毛刺。

The modal tests of PCB and PCB assembly (free boundary condition and fixed boundary condition) were carried out. The equivalent elastic modulus and damping parameters of PCB can be gained, and the fixed boundary condition of finite element model was also determined. These will help to the following work.Second, drop impact tests of three different heights were carried out. Strains and acceleration responses of PCB were measured. Failed BGA packages of different test conditions were dyeing, and cross section analysis of failed solder joints was conducted.

针对JEDEC标准试件的局限性，提出了设计便于统计学研究焊点可靠性的试验试件的构想，利用有限元模态分析方法确定并验证了用圆形PCB组件替代JEDEC标准试件的可行性；通过一系列模态试验和有限元模态分析，确定了圆形PCB组件的相关试验参数，这不仅为跌落碰撞下PCB组件有限元模拟确定了较为合理准确的有限元模型，而且为正确地评价跌落碰撞下PCB组件的可靠性问题奠定了基础。2。

The modal tests of PCB and PCB assembly (free boundary condition and fixed boundary condition) were carried out. The equivalent elastic modulus and damping parameters of PCB can be gained, and the fixed boundary condition of finite element model was also determined. These will help to the following work. Second, drop impact tests of three different heights were carried out. Strains and acceleration responses of PCB were measured. Failed BGA packages of different test conditions were dyeing, and cross section analysis of failed solder joints was conducted. It was found in our drop tests that the root cause of lead-free solder joints under drop impact was the combined effect of mechanical shock and PCB bending vibration.

针对JEDEC标准试件的局限性，提出了设计便于统计学研究焊点可靠性的试验试件的构想，利用有限元模态分析方法确定并验证了用圆形PCB组件替代JEDEC标准试件的可行性；通过一系列模态试验和有限元模态分析，确定了圆形PCB组件的相关试验参数，这不仅为跌落碰撞下PCB组件有限元模拟确定了较为合理准确的有限元模型，而且为正确地评价跌落碰撞下PCB组件的可靠性问题奠定了基础。

50 Time-mated pregnant rats were divided into five groups and injected daily from gestational days 7 to 18 with either 2,2′,4,4′-tetrachlorobiphenyl (PCB 47) at the dosage of 1.00 or 20.00 mg/kg body weight;or 3,3′,4,4′-tetrachlorobiphenyl (PCB 77) at the dosage of 0.25 or 1.00 mg/kg body weight;or sesame oil to investigate the effects of fetal and lactational PCB exposure on reproductive behavior in male and female laboratory rats.

将50只同期怀孕的大鼠分为5组，在怀孕第7-18 d，每天分别给两组大鼠腹腔注射1.00 和20.00 mg/kg体重2， 2′， 4， 4′-四氯联苯(PCB 47)；分别给另两组注射0.25和1.00 mg/kg体重3， 3′， 4，4′-四氯联苯(PCB 77)；对照组注射0.10 mL芝麻油。

The filter includes a cavity formed by metal hull, the inner of the cavity has a PCB double-faced board which fixed at the side wall of the metal hull, between the up and down inner wall there has a certain air height; one side of PCB double-faced board etches cross nodel line transmission line with destined type.

滤波器包括由金属壳形成的一腔体，腔体内设置一PCB双面板，PCB双面板固定在金属壳的侧壁上，与金属壳的上下内壁具有一定空气高度；PCB双面板的一面蚀刻有预定形状的十字节级联传输线。

E0078: When the PCB was transfered to fixed conveyor of PCB exit Side ,error happened for time over Maybe the PCB stoppered between fix conveyor and moving enveyor or the PCB stopped is fixed

当PCB 传送到PCB出口处边的固定运输轨时，发生超时故障，PCB 可能停在固定运输轨和移动轨之间，或PCB停在PCB出口边的固定运输轨中，用手将PCB放在正常位置。

The company has more than 2000 square meters factory area, more than 100 employees, main products have PCB Flying Probe Tester, PCB Milling Machine, PCB Drilling Machine tooling, jig machines, CNC drilling machine, engraving machine, engraving and milling machine, machining center , cell phone acrylic lenses machine, glass equipment, Extruder Dies CNC drilling machine, woodworking machine tools and so on, more than 500 users all over Guangdong, Zhejiang, Jiangsu, Shanghai, Shandong, Fujian, Guangxi, Beijing, Sichuan, Chongqing, Henan and other places, and exported to Southeast Asian countries.

公司拥有厂房面积2000多平方米，员工100余人，主要产品有PCB飞针测试机、PCB铣边机、PCB模具钻孔机、治具机、数控钻床、雕刻机、雕铣机、加工中心、手机压克力镜片机、玻璃专用设备、膨化机模具数控钻床、木工机床等，用户500多家，遍布广东、浙江、江苏、上海

The results reveal that two energy transfer paths (i. e.β-PEB→α/β-PCB and β-PEB→α/βPCB′) with time constants of 50ps and 200ps, respectively, exist in R-PC monomers, and that α/β-PCB′chromophores are the terminal emitting acceptors with fluorescence lifetimes of 1150 ps. The experimental results of time-resolved fluorescence spectroscopy in case of R-PC trimers exhibit that the corresponding energy transfer processes are faster in R-PC trimers than in R-PC monomers, with time constants being 45ps, 165 ps and 920ps.

结果显示：在R-PC单体中存在2条能量传递途径，即β-PEB→α/β-PCB和β-PEB→α/β-PCB′能量传递过程，其时间常数分别为50ps和200ps；作为终端发色团的α/β-PCB′的荧光发射时间常数为1150ps.R-PC三聚体的时间分辨荧光光谱实验结果显示对应的能量传递过程速率加快，其时间常数分别为45ps，165ps和920ps。

Is a professional manufacturer of single-sided and multilayer circuit board manufacturers, in the face of highly competitive PCB market, the company broke the single product structure to PCB industry based on the implementation of a diversified operation, with the exception of PCB production, but also sales of copper clad laminates and electronic components, while a number of factory lines to solve environmental problems, I Division also provides drag-cylinder boards, Recycling Waste CCL, waste water stripping, drilling aluminum, gold / tin frame .

广州市百弧电子材料有限公司是一家专业生产单双面及多层线路板的厂家，面对竞争激烈的线路板市场，公司打破单一产品结构，以PCB产业为依托，实行多元化经营，除生产PCB外，还销售覆铜板和电子元器件，另外为众多线路板厂解决环保问题，我司还提供拖缸板，回收废覆铜板、废退锡水、钻孔铝片、金/锡边框。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。