0243368} PCB jootemaski saab kuvada erinevates värvides, sealhulgas roheline, valge, sinine, must, punane, kollane, matt, lilla, krüsanteem, ereroheline, mattmust, mattroheline ja nii edasi. Tavaolukorras on LED-valgustite tootmine valge, neid tooteid tuleb kasutada valgetes PCB trükkplaatides, muud värvid tulenevad enamasti toote liigitussüsteemist, iga ettevõte on erinev, mõned kasutavad punast katsetahvlite tähistamiseks, mõned kasutavad sinist. tahvli fookuse tähistamiseks ja mõned kasutavad musta värvi, et tähistada arvuti siseruumides kasutatavaid tahvleid.
0243368} Miks on siis enamik PCB-sid rohelised? Põhjus pole keeruline. Enamik rohelisel PCB-st on tegelikult jootekindla rohelise õli värv, roheline on kõige mitmekülgsem, kuna roheline protsess on kõige küpsem, kõige lihtsam ja selle tootmiskulud on kulutõhusamad, lisaks rohelisele väljaspool erkrohelist, heleroheline, mattroheline jne.
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SHOW FULL COLUMNS FROM `web_b2b_column` [ RunTime:0.000818s ]
SELECT `a`.`id`,`a`.`column_name`,`a`.`parentid`,`a`.`page_url`,b.column_name as title FROM `web_b2b_column` `a` LEFT JOIN `web_b2b_column` `b` ON `a`.`id`=b.base_id AND b.lang_id=46 WHERE `a`.`status` = '1' AND `a`.`lang_id` = '46' ORDER BY `a`.`sortid` ASC,`a`.`id` ASC [ RunTime:0.000254s ]
SHOW FULL COLUMNS FROM `web_customer_news_lang_46` [ RunTime:0.000937s ]
SELECT `a`.*,b.title cat_name FROM `web_customer_news_lang_46` `a` LEFT JOIN `web_customer_news_category` `b` ON `a`.`cat_id`=`b`.`id` WHERE `a`.`status` = '1' AND `a`.`on_b2b` = '1' AND `a`.`id` = '2011' LIMIT 1 [ RunTime:0.001241s ]
SHOW FULL COLUMNS FROM `web_system_customer` [ RunTime:0.001163s ]
SELECT * FROM `web_system_customer` WHERE `is_online` = 1 AND `id` = 143 LIMIT 1 [ RunTime:0.000384s ]
SELECT `a`.`id`,`a`.`title`,`a`.`cat_id`,`a`.`link_url` FROM `web_customer_news_lang_46` `a` LEFT JOIN `web_system_customer` `b` ON `a`.`customer_id`=`b`.`id` WHERE `a`.`status` = '1' AND `a`.`on_b2b` = '1' AND `b`.`is_online` = '1' AND `a`.`id` > '2011' ORDER BY `a`.`id` DESC LIMIT 1 [ RunTime:0.002101s ]
SELECT `a`.`id`,`a`.`title`,`a`.`cat_id`,`a`.`link_url` FROM `web_customer_news_lang_46` `a` LEFT JOIN `web_system_customer` `b` ON `a`.`customer_id`=`b`.`id` WHERE `a`.`status` = '1' AND `a`.`on_b2b` = '1' AND `b`.`is_online` = '1' AND `a`.`id` < '2011' ORDER BY `a`.`id` DESC LIMIT 1 [ RunTime:0.001810s ]
SELECT `a`.`id`,`a`.`title`,`a`.`abstract`,`a`.`pic`,`a`.`create_time`,`a`.`link_url`,b.title cat_name,`c`.`username`,`d`.`company_name` FROM `web_customer_news_lang_46` `a` LEFT JOIN `web_customer_news_category` `b` ON `a`.`cat_id`=`b`.`id` LEFT JOIN `web_system_customer` `c` ON `a`.`customer_id`=`c`.`id` LEFT JOIN `web_customer_website_setting` `d` ON `a`.`customer_id`=d.customer_id AND d.lang_id=46 WHERE `a`.`status` = '1' AND `a`.`on_b2b` = '1' AND `c`.`is_online` = '1' ORDER BY `a`.`hits` DESC,`a`.`create_time` DESC,`a`.`id` DESC LIMIT 6 [ RunTime:0.000416s ]
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