I think this was one of those where they wanted to get paid beforehand, before showing any kind of work.
comment "This is a string for sure" // nope, an opaque scalarCopy，更多细节参见PDF资料
，详情可参考币安_币安注册_币安下载
Those companies knew they had a captive audience, so they bought up as many journals as they could. Journal articles aren’t interchangeable commodities like corn or soybeans—if your science supplier starts gouging you, you can’t just switch to a new one. Adding to this lock-in effect, publishing in “high-impact” journals became the key to success in science, which meant if you wanted to move up, your university had to pay up. So, even as the internet made it much cheaper to produce a journal, publishers made it much more expensive to subscribe to one.。PDF资料是该领域的重要参考
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