来自MSN

How a 72 Second Signal From Space Became the Biggest Mystery in Astronomy

In 1977, astronomers recorded an unexplained 72-second radio signal stronger than anything else detected from deep space. Dubbed the “Wow Signal,” it came and went without warning, never repeating ...
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电/气动高性能密封蝶阀

GEROYAL，作为高品质的工业控制阀制造商及供应商，企业总部位于英格兰(GERO INDUSTRIAL AUTOMATION CO., LTD)，自公司年成立以来，GEROYAL一直致力于为客户提供全套工业控制阀解决方案，专业从事工业控制阀及执行机构的生产、研发、销售和服务。经过多年的努力，我们 ...