A single rocket is not powerful enough
to send a spaceship into space. This is because all the fuel a single rocket
can. carry is not enough to give the necessary amount of power. To get enough
fuel and power to last till the spaceship gets out of the Earth’s gravitation
force (引力) , a number of rockets are needed. These rockets are connected one on
top of the other, looking much like a large tower. Together they form a
multi-stage rocket. The spaceship lies at the top of the multi-stage
rocket. The first stage of a multi-stage rocket is called the
booster. It is the biggest as it has to lift the whole thing from the ground.
The booster helps to lift the rockets into the sky. When the fuel of the booster
is used up, it separates from the rest of the rocket and drops to the Earth.
When this happens, the second stage fires and pushes the rocket A. The booster B. The second rocket C. The third rocket D. The multi-stage rocket
更多"A single rocket is not powerful eno"的相关试题:
[单项选择]
A single rocket is not powerful enough
to send a spaceship into space. This is because all the fuel a single rocket
can. carry is not enough to give the necessary amount of power. To get enough
fuel and power to last till the spaceship gets out of the Earth’s gravitation
force (引力) , a number of rockets are needed. These rockets are connected one on
top of the other, looking much like a large tower. Together they form a
multi-stage rocket. The spaceship lies at the top of the multi-stage
rocket. The first stage of a multi-stage rocket is called the
booster. It is the biggest as it has to lift the whole thing from the ground.
The booster helps to lift the rockets into the sky. When the fuel of the booster
is used up, it separates from the rest of the rocket and drops to the Earth.
When this happens, the second stage fires and pushes the rocket A. several rockets which are separated from each other B. a single rocket with enough fuel C. the booster which is the biggest and can lift the whole rocket from the ground D. a rocket with several parts, and each of which can help to push the spaceship into the space
[单项选择]
A (1) holds enough bits to store a single character while a (2) is a group of bytes.
(1)处应选择() A. word B. byte C. bit D. chip
[填空题] Rocket Renaissance The Ear of Private Spaceflight Is About to Start Background Two years ago, people witnessed the first space travel by SpaceShip One. Three people were involved in this flight: Burt Rutan, who designed the craft, and Mike Melvill, who flew it--although they were ably assisted by Paul Allen, one of the founders of Microsoft, who paid for it. Certainly, people have long been known that manned spaceflight was possible. What they showed was that it is not just a game for governments. Private individuals can play, too. People involved Now, lots of people want to join in, and most of them have just met up at the International Space Development Conference in Los Angeles, to engage in that mixture of camaraderie and competition that characterises the beginnings of a new technology. And, as might be expected, they have two of the necessary ingredients of succ
[填空题]The British barrage rocket
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