直流电

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为什么电容直流电路中电流是0？？

艾丽莎_039 2021-07-22 11:23 开发者_C百科因为在直流回路中，电流和电压的方向和大小是不变化的，电容两端的电压不变，通过电感的磁通也不变，所以电容就相当于断路，而电感相当于短路。qkoufu27600[详细]

2023-02-07 23:26 分类：问答
直流电220v电源二氧保护焊机多少钱一台？？

JznoedHO 2021-11-08 14:02 上海烽火NBC-270Y双电压开发者_开发问答二氧化碳气保焊（220/380V）[详细]

2023-01-15 18:44 分类：问答
求一个爱上一个人的个性签名！？

oeasyasd 2022-03-14 05:17 开发者_开发问答暗恋一个人的QQ个性签名如下： 1、曾经的暗恋，如今的回忆。[详细]

2022-12-29 00:44 分类：问答
How to get last 12 digits from a string in MySQL?

How would I get last 12 digits of a string using mysql? Let\'s say I have a varchar field with a tracking number, that may be anywhere from 5 to 20 varchars long.But I only need to select last 12 dig[详细]

2022-12-28 05:40 分类：问答
How can I use the function CoGetClassObject in x64

I have a COM DLL that is compiled in 32-bit mode (the server side). I registered开发者_如何学运维 it and tried to call CoGetClassObject() from a 32-bit client for getting the IClassFactory.[详细]

2022-12-28 05:08 分类：问答
Apache - Restrict to IP not working

I\'ve a subdomain that I only want to be accessible internally; I\'m trying to achieve this in Apache by editing开发者_C百科 the VirtualHost block for that domain. Can anybody see where I\'m going wro[详细]

2022-12-28 03:54 分类：问答
PHP & MySQL delete image link problem

I\'m trying to create a delete image link if the image is present and when the user clicks the delete image link it should delete the image. But for some reason this is not working can someone help me[详细]

2022-12-27 09:38 分类：问答
MS SQL server and Trees

Im looking for some way of extrating data form a tree table as defined below. Table Tree Defined as :-[详细]

2022-12-27 03:59 分类：问答
Adding an encapsulated email (like a forwarded email) from Zend Mail

I\'m trying to get Zend_Mail to send an encapsulated message - as though it\'s forwarding an email开发者_Python百科.[详细]

2022-12-27 02:58 分类：问答
Can PHP Includes be used to onClick load one page inside another

Need to load the content of one page inside another to simulate tabbed panels. The current methods I have tried do not work. Iframe does not readjust size to conform with the collapsible panels and wi[详细]

2022-12-27 00:56 分类：问答