显示的晶须是四分位间距的1.5倍。
第一款晶体管收音机-丽晶TR - 1(Regency TR-1),1954年以49.99美元的价格面市,其中包含四个晶体管。
The first transistor radio, the Regency TR-1, went on the market for $49.99 in 1954. The radio contains four transistors.
非常有趣的是,发育中的哺乳动物晶胚的心脏在分化为四腔室前,与斑马鱼的双腔心脏非常相似。
Intriguingly, before the heart of a developing mammalian embryo separates into four Chambers, it looks similar to the two-chambered zebrafish heart.
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