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subclass    
n. 亚纲,子集

亚纲,子集

subclass
子类

subclass
子类

subclass
n 1: (biology) a taxonomic category below a class and above an
order

Subclass \Sub"class`\, n.
One of the natural groups, more important than an order, into
which some classes are divided; as, the angiospermous
subclass of exogens.
[1913 Webster]

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  • History of gunpowder - Wikipedia
    Gunpowder is the first explosive to have been created in the world Popularly listed as one of the "Four Great Inventions" of China, it was invented during the late Tang dynasty (9th century) while the earliest recorded chemical formula for gunpowder dates to the Song dynasty (11th century)
  • The Dawn of Destruction: Who Invented Gunpowder and When Were . . .
    The invention of gunpowder is attributed to Chinese alchemists who, during the Tang Dynasty, were deeply immersed in experiments involving various chemical substances Their primary goal was not to create an explosive material but to find a potion that would grant eternal life
  • Ancient Chinese Invented Gunpowder - ThoughtCo
    Ancient Chinese alchemists accidentally invented gunpowder while searching for a way to live forever The Song Dynasty used gunpowder for weapons like rocket arrows and early cannons against the Mongols
  • When Was Gunpowder Invented? The History of Gunpowder
    By the 11th Century CE, texts of the Song Dynasty record the first chemical recipe for gunpowder Many early gunpowder recipes included ingredients besides sulfur, charcoal, and saltpeter, which were included for a variety of purposes
  • Gunpowder in Medieval China – Science Technology and Society . . .
    The formulas perfected by Song-Yuan dynasty alchemists, and the weapons first fielded by Chinese armies, form the bedrock of all subsequent gunpowder technology
  • Song Dynasty China | Asia for Educators - Columbia University
    Song military engineers found gunpowder to be helpful in siege warfare, leading to the development of early types of rockets, cannons, bombs, and mines
  • History of Gunpowder | World of History
    The invention of gunpowder originated in China, but its use and spread profoundly impacted civilizations across the world Invention (9th century AD): Gunpowder was first invented in China during the Tang Dynasty (618–907 AD)





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