Популярный цитрусовый фрукт оказался защитником от болезни почек

· · 来源:tutorial资讯

Предсказано будущее цен на нефть в случае длительной блокировки Ормузского проливаПять недель блокировки Ормузского пролива приведут к росту цен на нефть до $100

63-летняя Деми Мур вышла в свет с неожиданной стрижкой17:54

透视“速成车”电影对此有专业解读

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.。关于这个话题,51吃瓜提供了深入分析

Be the first to know!

Россиянам