查询词典 PCB

Use the camera system X、Y and micro-angle to contraposition, BGA solder ball overlap with the PCB board plate

利用摄像对位系统X、Y微及角度微调进行对位，使BGA锡球与PCB板焊盘重叠

Uses completely imports the thermostable nylon (PA66) raw material to add the fire protection textile fiber fine note to become again, has does not plate the electricity, artistic, thermostable and the antiseptic property is good, can when welds and the wave front welds the body had guaranteed that does not distort on machine the board not crookedly, fixes on the PCB board!

全部采用进口耐高温尼龙（PA66）原料再加防火纤维精注而成，具有不镀电、美观、耐高温及防腐性能好，能在焊接及过波锋焊时体保证在机板上不变形不歪斜，固定在PCB板上！

In the future, Gainward and the whole Palit group plan to position their retail strategy on custom-build PCBs, with a straight policy of releasing a top-notch, no-cost-saving PCB for the high end model and optimizing for "higher-end" and "affordable price points".

在耕升以及整个同德集团的规划中，其零售策略定位在非公版显卡，为高端模组推出专为其进行优化的不惜工本的顶级PCB和可承受的价格。

Author hopes to detect PCB defection based on this method. The experiments testify validity of this method.

其三在第四章我们就PCB缺陷检测系统的构成及其设备的性质、特点进行了分析，就部分设备的选择进行了研究。

We can receive the result of interfere after importing the parameter. We can also detrude the parameter of trace and PCB when we regulate the settled coupling request.

也可以根据固定的对端接敏感器件的走线耦合要求或标准推导出相应的走线和PCB的物理结构参数，以此来指导设计。

There are a number of PCB dielectric materials on the market today.

在当今的市场上有相当数量的 PCB 绝缘材料。

According to the demand of high magnetic field power supply, reference is increased with a set ramp rate and stops at a set stable value, so reference system is composed of digital setting and digit to analog converting circuit. But the stability of reference is mostly guaranteed by the performance of D/A circuit, so D/A circuit is particularly studied in reference system. The scheme of D/A circuit, the selection of DAC and its voltage reference, hardware anti-jamming design and PCB design are discussed in detail, and software of remote control and PLC are discussed in brief. Zero-flux DC current transformer well satisfies the demands of the high stability of Load current detection unit, so the principle of zero-flux DC current transformer is analyzed; in the mean time a project which detects the long term stability is designed. During 8 hours, analog signal which is detected with high precision digit multimeter is recorded in computer at 1HZ frequency by GPIB communication. The drift error source and related parameters are explained in the compare-amplify part. Detailed subtraction circuit is designed; also amplifier chip and periphery components are selected and verified according to the theory of error analysis.

根据强磁场电源的需求，参考源应按照软件设定的斜率逐渐上升到设定稳态值，则参考源系统应由数字给定和数模转换电路两大部分组成，而参考源的稳定度主要依靠完成数模转换功能的模拟电路的性能来保证，因此本文对参考源系统的研究以数模转换电路为重点，分别从电路方案的确定、数模转换芯片及其基准电压源的选取和验证、电路板硬件抗干扰和PCB设计几方面进行了论述，然后对数字给定部分的远控组态和PLC程序设计作了简要介绍；采用零磁通原理的直流电流转换器很好地满足了对负载电流检测单元高稳定度的需求，本文详细分析了零磁通检测的原理，并在选定此种类型电流转换器的基础上设计了一套检测长期稳定度的方案，8小时内以1秒为采样周期，通过计算机Labview程序和高精度数字电压表的GPIB通讯，将被高精度数字电压表数字化后的模拟信号采样值连续记录至计算机中；比较放大环节简要阐述了漂移产生的原因和相关参数指标，确定了具体的减法电路形式，并根据误差分析理论对运算放大器和外围元器件进行了选取和验证。

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本公司专业生产和经营：国产进口双光牛皮纸、压合牛皮纸、淋膜牛皮纸、票据打印纸，包装牛皮纸，精制牛皮包装纸、牛卡纸、单光纸、书写纸、绝缘纸、单、双面拷贝纸、单、双面铜板纸、灰底白板纸、白底白板纸、新闻纸、国产/进口双胶纸、棉纸、及BOPP光膜，亚膜等各类工业用纸及特殊包装用纸，办公用纸和食品用纸，品种共1800多种，涉及行业有玻璃厂、玩具厂、制衣厂、鞋厂、印刷厂、纸品包装厂、胶粘制品厂、铝材厂、食品厂，光学仪器厂、皮具厂、线路板厂、PCB电路板厂、覆铜板厂、大型电子厂、电镀厂等。

The expression of differential pair CM inductance on PCB is deduced under the condition of departuring ground plane center and spanning discontinuously ground plane based on the model of microstrip.

以多层板的微带线为模型，推导出在偏离地平面中心以及跨越不连续地平面的情况下，PCB上差分对共模电感的定量表达式，并对其共模噪声的特性进行了详细讨论。

Based on the discrete distribution characteristics of coil turns, the position error mathematical models of PCB air-core coils are set up and then analyzed.

该文基于线匝的离散分布特性建立了PCB空心线圈位置误差的数学模型，并进行了详细分析。

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。