持续的涨价压力正倒逼行业加速转型。一方面，企业加大研发投入，优化生产工艺以减少原料损耗，并向光伏用超细钨丝等高附加值产品升级；另一方面，废钨回收（再生钨）领域迎来发展机遇，通过打造“城市矿山”来缓解原生钨供应紧张的局面。
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。PDF资料是该领域的重要参考
Фото: iWissawa / Shutterstock / Fotodom
For a “classic” chain of if/else tests to go through options, this sort of continuous decrement is the way to do it. In this case, we have to move all three sprites down a bit and also change the patterns on sprites 5 and 6 to make them be the bottom corners instead of the top ones: