Database error: Invalid SQL: update pwn_comment set cl=cl+1 where id='112697' and iffb='1'
MySQL Error: 1142 (UPDATE command denied to user 'sdm221825289'@'' for table 'pwn_comment')
#0 dbbase_sql->halt(Invalid SQL: update pwn_comment set cl=cl+1 where id='112697' and iffb='1') called at [/data/home/syu2244780001/htdocs/includes/] #1 dbbase_sql->query(update {P}_comment set cl=cl+1 where id='112697' and iffb='1') called at [/data/home/syu2244780001/htdocs/comment/module/CommentContent.php:68] #2 CommentContent() called at [/data/home/syu2244780001/htdocs/includes/] #3 PrintPage() called at [/data/home/syu2244780001/htdocs/comment/html/index.php:13]  网友点评--深圳荣汇光电有限公司
发布于:2018-7-25 16:49:34  访问:114 次 回复:0 篇
版主管理 | 推荐 | 删除 | 删除并扣分
Electronic Projects
The entire process of manufacturing printed circuit boards follows the actions below for many applications:
Basic Procedures for Manufacturing Printed Circuit Boards:
1. Setup - the entire process of determining materials, processes, and requirements to generally meet the customer`s specs for the board design based on the Gerber file information provided with the purchase order.
2. Imaging - the process of transferring the Gerber file data for the layer onto an etch resist film that is placed on the copper layer that is conductive.
3. Etching - the original procedure for exposing the copper and other areas unprotected by the etch resist film to a chemical that eliminates the copper that is unprotected leaving the protected copper pads and traces in place; newer procedures use plasma/laser etching as opposed to chemicals to remove the copper material, allowing finer line definitions.
4. Multilayer Pressing - the process of aligning the conductive copper and insulating dielectric layers and pushing them under temperature to trigger the adhesive in the dielectric levels to make a solid board product.
To understand about soldering chips and solder iron for electronics, please visit all of our page solder iron.
Therefore, there you`ve got it, a finished string of solar cells you need to use. How many strings of cells you make up per panel depends upon exactly what voltage you might be targeting. Building a DIY panel that is solar enjoyable and may save money, but make no mistake, there is work involved. You might choose for just buying your solar power from the shelf, however, if cost is really a element and you have persistence, a DIY cell is not a difficult project.
Solder fumes from soldering utilizing rosin-cored solder may cause asthma. You need to always try and avoid experience of any substances which will cause asthma. If that`s not reasonably practicable, control short and term that is long to avoid asthma developing by installing LEV (neighborhood exhaust ventilation or fume removal). If someone develops work-related asthma, also really low degrees of solder fumes floating around can trigger an assault.
When solder flux is heated above 183 Deg. C, (or higher for Lead complimentary) a complex blend of resin acid particulates (smoke) and gases are generated - this might be called `COLOPHONY` and is created from Hand Soldering, Solder Pots and Fountains, Wave Solder devices and Reflow Ovens
共0篇回复 每页10篇 页次:1/1
共0篇回复 每页10篇 页次:1/1
验 证 码

传真: 0755-27956664

CopyRight © 2012-2016. RONGHUILED.COM 深圳荣汇光电有限公司 粤ICP备15102155号-2 版权所有 All Rights Reserved.