Finally, they designed a powerful weapon.They flled a hollow(空心的) piece of bamboo with the powder. Then they stuffed(填充) arrows(箭) in it. Theseweree the first rockets.That's the way t is with inventions. The inventor gets an idea. As he figures out his invention, he has to ...
These were the first rockets. That’s the way it is with inventions. The inventor gets an idea. As he figures out his invention, he has to try and experiment with different things. And sometimes he gets unexpected results. 1. Which of the following is true? A. Ancient Chinese invented ...
Isaac was fascinated by___. He discovered that white light is in fact made up of all the colours of the rainbow. Isaac also invented a special reflecting telescope, using mirrors. It was much more powerful than other telescopes. Isaac made...
1. Which of the following is true? A.Ancient Chinese invented gunpowder by accident. B.Ancient Chinese invented gunpowder to make rockets. C.Ancient Chinese invented gunpowder to make fireworks. 2. What’s the Chinese meaning of the underlined word “exploded”?
into the air and a set of wings to glide it back to a successful landing. However, because rockets are inefficient at low speeds for general aviation, this use of jet propulsion was essentially a one-time stunt. In any event, his effort was rewarded with a position in the Ottoman Army....
Like so many other modern conveniences that we take for granted, the history of the elevator is more complicated than it may seem at first glance. Believe it or not, there's some controversy over who invented this commonplace contraption.
Her work at DuPont combined her childhood love of science and fabric with her interest in helping people and solving problems, and her creations would change the world.At DuPont, Stephanie invented Kevlar fiber. It’s five times stronger than steel. Kevlar fiber is now used in more than 200...
Who really invented the computer?A. Charles Babbage.B. Bill Gates.C. Alan Turing.D. Thomas Edison.2. When was the computer the biggest?A.In 1642.B. In 1936.C. In the 1940s.D. In the 1970s.3. Which of the following statements is TRUE?A. Charles Babbage built an analytical ...
Our house is in the middle of Gulangyu. Behind our house there is a big old tree. My grandfather tells me that the tree is very,very old. There are many birds in the tree. We call it a “bird tree”. Our house is near the sea. The sea is big and blue. There are a lot of...
D. Diesel engines were mainly used on airplanes and rockets. 6.What is the passage mainly about? A. Several inventions that are named after their inventors. B. Several inventions that were invented by blind inventors. C. Several inventions that made their inventors rich. D. Several inventions...