2. B "Perhaps some of the tubes jumped out of the fire instead of exploding in it. "以及下文 的“that the gunpowder escaping from the tube could lift it into the air"可知,中国人发现了 (discovered)这一现象。 3.A 根“Rockets were probably invented by accident about 2,000 years ago."...
Rocketswereprobablyinventedbyaccidentabout 2000 yearsago.TheChinesehad a formofgunpowderwhichwasputinbambootubesandthrownintofirestomake(1)___•duringfestivals.Perhapssomeofthetubesjumpedoutofthefireinsteadofexplodinginit.TheChinesediscoveredthatthegunpowder(2)___ fromthetubecouldliftitintotheair.Theideaofth...
Previous chapter: Rockets home pageA dart propelled from a cannon was probably invented in England or elsewhere in Western Europe around 1327. The emergence of firearms is dated around 1313. (Photo illustration)SUPPORT THIS PROJECT!Reactive principleAlthough in the 20th century rockets came to ...
The person who found a solution to this problem revolutionized the concept of the elevator. But was it Elisha Otis, or Otis Tufts? While working in a factory in 1852, Elisha Otis and his sons came up with an elevator design that employed a safety device. A wooden frame at the top of ...
Many new things are invented each year. Interestingly, some inventions are named after the people who invented them, making the inventions and inventors easier to be remembered. The bowler hat is named after London hat-makers Thomas and William Bowler. The brothers received an order from Edward ...
Who should be responsible for this? Or maybe you try to help someone in danger, but you 1 hurt the person. Will you get in trouble for this? China’s Civil Code (《民法典》) will give you the 2 . On May 28, the National People’s Congress (全国人民代表大会) agreed China’s ...
The LA District Attorney said at a press conference that one person is under arrest for arson. Are there others who didn’t get caught? Maybe, but I don’t lend a lot of credence to this theory. A much better way to torch inconvenient facilities, or even cities, would be to start a...
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F.Simply make up your mind to be the happiest person you know, and you will be. G.Be grateful to the people in your life, and practice saying thank you for any politeness they show you. 【解题导语】 自己才是幸福感觉的源泉,不要仅仅从外部寻找幸福的来源,要自己去 创造。 1....