
为什么要控制PCB的BGA大小? - 知乎
作为在PCB行业摸爬滚打快十年的老鸟,画过的板子比吃过的盐都多 (夸张了,但板子确实堆成山)。说到BGA封装的大小控制,这真是硬件设计里一个让人又爱又恨的“度”的艺术。 先说结 …
Pneumococcal 21-valent conjugate vaccine (intramuscular route)
Sep 1, 2025 · Description Pneumococcal 21-valent conjugate vaccine is an active immunizing agent used to prevent infection caused by certain types of pneumococcal bacteria …
Premature ventricular contractions (PVCs) - Mayo Clinic
Sep 20, 2025 · To diagnose premature ventricular contractions (PVCs), a healthcare professional examines you. You usually are asked questions about your medical history and lifestyle habits. …
PCB的两截式金手指怎么制作呢? - 知乎
电镀硬金:这种金是实心(硬)且厚(通常为30u),因此更适合持续使用PCB的磨蚀效果。 4. 金手指的制作流程 金手指的制作流程包括以下几个步骤: 覆盖蓝胶:除了需要镀硬金的PCB金 …
Primary biliary cholangitis - Symptoms and causes - Mayo Clinic
Primary biliary cholangitis is an autoimmune disease in which the bile ducts are inflamed and slowly destroyed. It previously was called primary biliary cirrhosis. Bile is a fluid made in the …
电子信息工程的就业方向是怎样的? - 知乎
以前在一个网站上看到的,一位前辈写的,回答这个问题很合适,分享给大家。 如果从工程师和研究生的专业方向来看,电子信息专业的方向大概有 ) 1)数字电子线路方向。从事单片机(8位 …
Primary biliary cholangitis - Diagnosis and treatment - Mayo Clinic
Primary biliary cholangitis is a type of liver disease that damages the bile ducts. Early recognition and treatment may help prevent complications.
4090 魔改 48g 显存是怎么做到的? - 知乎
4090的核心和3090的核心针脚一样,所以它可以焊到3090的PCB板子上并被识别; 3090用的是24*1GB的显存颗粒,板子没有限制显存颗粒容量,可以换成2GB的;
Pneumococcal 20-valent conjugate vaccine (intramuscular route)
Mar 1, 2025 · Description Pneumococcal 20-valent conjugate vaccine is an active immunizing agent used to prevent infection caused by certain types of pneumococcal bacteria …
如何改善PCB的ICDs现象? - 知乎
在PCB设计和制造中,互连延迟是指信号在电路板上从一个点传输到另一个点时所经历的时间延迟。 这种延迟可能由多种因素引起,包括线路长度、线路宽度、电路板材料、信号频率等。 改 …