[化工] 静电分离器;[农机][矿业] 静电选矿机

Scientists: Spiders Use Electric Fields to Move through Air Scientists have long wondered how spiders can use the webbing they make to fly. The 19th century English naturalist Charles Darwin commented on their behavior when very small spiders landed

发表于:2018-12-16 / 阅读(173) / 评论(0) 分类 2018年VOA慢速英语(七)月
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