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10d
高精密厚膜印刷工艺在电真空陶瓷管壳中的技术应用
电真空陶瓷管壳是一种关键的电子元器件外壳,由于具有耐高温、耐腐蚀、绝缘性能优、真空度高、机械强度高的特性,被广泛用于封装高端半导体元器件、国防军工、电力输送和工业动力装置, 如电真空管开关、高频大功率电子管和大规模集成电路。
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5d
扇贝为何有200多只眼睛
眼睛结构巧妙,功能重要,被达尔文称赞为“极其完美的器官”。动物界中,约有2/3的物种都有眼睛。其中,扇贝眼睛众多,有些种类(如欧洲大扇贝)的眼睛甚至有200多只。这些眼睛长在左右两壳内肉质的外套膜(又称“裙边”)上。 在寒武纪之前,动物眼睛类型单一,只有简单原始的杯状眼存在。随着生物爆发式演化,动物眼睛类型开始多样化,可大致分为单眼和复眼两类。
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