如何快速检查钢网开口面积比是否符合 IPC7525
在 IPC7525 规范中,针对面积比和宽厚比这两个重要参数,给出了详细计算公式,如下图一所示。在实际印刷过程中,当钢网和 PCB 分离的时候,锡膏处于被两者争夺的状态,即:锡膏将被转移到 PCB 焊盘上,或留在钢网开孔的孔壁内。 研究表明:当面积比(即开口面积与钢网孔壁面积比值)大于 0.66,且...
2022-07-07 14:15【vayoinfo111】
阅读更多面试题 01.02. 判定是否互为字符重排-辅助数组算法
面试题 01.02. 判定是否互为字符重排 给定两个字符串 s1 和 s2,请编写一个程序,确定其中一个字符串的字符重新排列后,能否变成另一个字符串。 示例 1: 输入: s1 = “abc”, s2 = “bca” 输出: true 示例 2: 输入: s1 = “abc”, s2 = “bad...
2022-07-07 14:15【Mr Gao】
阅读更多23. 合并K个升序链表-c语言
23. 合并K个升序链表 c语言 给你一个链表数组,每个链表都已经按升序排列。 请你将所有链表合并到一个升序链表中,返回合并后的链表。 示例 1: 输入:lists = 1,4,5 , 1,3,4 , 2,6 输出: 1,1,2,3,4,4,5,6 解释:链表数组如下: 1 4 5, 1 3 4,...
2022-07-07 14:15【Mr Gao】
阅读更多1亿单身男女“在线相亲”,撑起130亿IPO
21亿单身男女“在线相亲”,撑起130亿IPO 它的上市只是腾讯“元宇宙”的一角? 作者:米古 编辑:九陆 “社交元宇宙”第一股又要IPO了。 i黑马获悉,近日,社交平台Soul正式向港交所递交招股书,计划在香港挂牌上市,美银证券、中金公司担任联席保荐人。早在2021年5月,Soul就向SEC...
2022-07-07 14:15【i黑马】
阅读更多JS中null NaN undefined这三个值有什么区别
我们在JS数据类型中肯定会遇到比较陌生的面孔,比如NaN和undefined,对于null我们在Java中就早早接触过,那么我们来通过代码看一下这三个东西有什么关系和区别呢? DOCTYPE html html head meta charset='utf 8' title null NaN un...
2022-07-07 14:15【Vayne的胖虎子】
阅读更多记录Servlet学习时的一次乱码
当学习 Servlet做单表的CRUD 的时候,遇到了一次比较离奇的乱码,因为我已经按照之前的帖子全都检查了一遍,还是没有发现是哪里的问题,他的现象十分古怪,别的乱码可能是一堆奇怪的符号,但是这个乱码就是servlet之间请求转发之后中文都变成了 问号 ,如下图所示: https://img bl...
2022-07-07 14:15【Vayne的胖虎子】
阅读更多URL和URI的关系
URL和URI的区别 标题我们经常会遇到URL和URI两个单词,但是很难去搞清楚两者是什么关系? 什么是URI? 统一资源标识符。代表网络中某个资源的名字。但是通过URI是无法定位资源的。 什么是URL?统一资源定位符。代表网络中某个资源,同时,通过URL是可以定位到该资源的。 URI和URL什么...
2022-07-07 14:15【Vayne的胖虎子】
阅读更多模拟Servlet的本质
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2022-07-07 14:15【Vayne的胖虎子】
阅读更多[Android -- data storage] use SQLite to store data
https://img blog.csdnimg.cn/344b7b67bcdd4ef4bd5f45821b199194.jpeg pic center One 、 Preface stay Android A total of five data storage methods are...
2022-07-07 16:24【Kevin-Dev】
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2022-07-07 16:24【kill-java】
阅读更多The team of East China Normal University proposed the systematic molecular implementation of convolutional neural network with DNA regulation circuit
Complex biomolecular circuits make cells with intelligent behavior , Can survive before the evolution of neural brain . since 1990 It was first sho...
2022-07-07 16:24【Zhiyuan community】
阅读更多01tire+ chain forward star +dfs+ greedy exercise one
The longest XOR path Title Description Given a tree n nn A weighted tree with two points , Node subscript from 1 11 Start to n nn. Look for...
2022-07-07 16:24【Soup key TJ】
阅读更多Pycharm terminal enables virtual environment
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2022-07-07 16:25【Bashan queer dialect】
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2022-07-07 16:25【Bashan queer dialect】
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2022-07-07 16:25【shy_ snow】
阅读更多3000 words speak through HTTP cache
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2022-07-07 16:25【I'm Leon】
阅读更多three. JS create cool snow effect
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2022-07-07 16:25【Ziwei front end】
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2022-07-07 16:25【Ziwei front end】
阅读更多Find tags in prefab in unity editing mode
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2022-07-07 16:26【Le_ Sam】
阅读更多Opportunity interview experience summary
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2022-07-07 16:26【Le_ Sam】
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