超星 - L25-句子单词 - 查题吧

单选题

Prior to the addition of the components to a board, solder paste needs to be added to those areas of the board where solder is required. Typically these areas are the component pads. This is achieved using a solder screen.

A. 元件添加
B. 焊锡膏
C. 元件焊盘
D. 焊锡屏（筛）

单选题

The board with the added solder paste is then passed into the pick and place process, the pick and place machines place large numbers of small, or large components quickly and accurately onto printed circuit boards.

A. 添加了焊锡膏
B. 快速地和准确地
C. 拾取和放置机器
D. 放置到印刷电路板

单选题

The pick and place machines are pre-programmed with the information about component positions so that they know where to place the components. This program is normally developed directly from the printed circuit board design information.

A. 在哪里放置元件
B. 印刷电路板设计信息
C. 元件位置信息
D. 预定编程的

单选题

Soldering in the production of electronic equipment can take many forms. In the mass production of electronic equipment, automated techniques such as wave soldering, or reflow soldering are widely used. Meanwhile manual soldering is still used both in commercial and home environments.

A. 手工焊接
B. 商业和家庭环境
C. 大规模生产
D. 自动化技术

单选题

Wave soldering is a process by which large printed circuit boards can be soldered quickly and reliably during PCB assembly.

A. 印刷电路板组装
B. 大的印刷电路板
C. 快速并可靠焊接
D. 波峰焊

单选题

The wave soldering process gains its name from the fact that the process passes the printed circuit boards to be soldered over a wave of solder (consists of a heated tank of solder). Wave soldering is usually used in PCB assembly for through hole mounted components.

A. 焊料波峰面
B. 焊料的加热箱
C. 焊波峰名字的由来
D. 通孔安装元件

单选题

Reflow soldering is the most common method of attaching surface mount technology ( SMT ) components to a printed circuit board. The goal of the reflow process is to heat and melt the solder, without overheating and damaging the electrical components.

A. 回流焊
B. 附着到印刷电路板
C. 表面贴装技术
D. 加热熔化焊料

单选题

Instead automatic optical inspection is a far more viable solution. Machines are available that are able to inspect boards and detect poor joints, misplaced components, and under some instances the wrong component.

A. 更可行的解决方案
B. 接合不良
C. 错放的元件
D. 自动光学检查

单选题

In-circuit test is to do the physical measurements (i.e. voltage, frequency) , then functional test is to check if the PCB does what it had been designed for.

A. 物理测量
B. 测量电压和频率等
C. 在线测试
D. 功能测试

单选题

ESD prevention may include setting up an ESD safe workstation , using anti-static mats and conductive flooring materials to conduct harmful electric charges away from the work area, wearing conductive garments and conducting wrist straps to prevent high voltages from accumulating on workers’ bodies, using ESD-safe bag to store and transport any ESD sensitive electronic component.

A. 防止高电压累积
B. 防静电安全工作台
C. 防静电垫
D. 导静电手腕带

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