I’d like to recommend a standard download website to everyone
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http://www.51zbz.com/
I also recommend a free website that requires no registration, offering plenty of materials and standards. Its name is: Standard Sharing Network www.bzfxw.com. I download many things from there, and I’ve noticed that many people download from it as well before posting them on other forums to make money. I hope everyone knows about this website; it’s completely free, so there’s no need to spend money unnecessarily
The website for checking standards provides the URL of the website where updates have been invalidated: http://www.csres.com/
I’d like to recommend another one: the Shizuishan Branch of the Boiler and Pressure Vessel Inspection Institute in the Ningxia Hui Autonomous Region, http://szgjs.vicp.net – it was created by me, hehe!!
I’ve taken a look; it can only be used for searching, and it needs to be purchased with money – it has no real value!!
I’d like to recommend a website where you can download things for free. You need to register by creating a username; an email address is required. After that, just register again. Website: www.bzjsw.com. If you have any questions, feel free to ask.
Recommended national-standard Jiujiu website: free, with many standards available