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To make another 11-second hypersonic flight at 10 times the speed of the sound. To make three more Hyper-X experiments. To retest the aircraft that is left. To make the aircraft fly higher and longer.
不填；the the; a 不填； a the; the
A jet engine that carries its own oxygen supply A jet engine that uses no oxygen A scramjet engine that doesn’t carry its own oxygen supply A rocket engine that carries its own oxygen supply
A jet engine that gets oxygen from the air. A scramjet engine that doesn’t carry its own oxygen supply. A rocket engine that carries its own supply of oxygen. A jet engine that uses no oxygen.
A jet engine that gets oxygen from the air. A scramjet engine that doesn’t carry its own oxygen supply. A rocket engine that carries its own supply of oxygen. A jet engine that uses no oxygen.
To make another 11-second hypersonic flight at 10 times the speed of the sound. To make three more Hyper-X experiments. To retest the aircraft that is left. To make the aircraft fly higher and longer.
A．Dahm of the University of Michigan say about the Hyper-X test flight It indicated the birth of a very fast airplane. B．It was self-powered, so it lasted only 11 seconds. C．It can transport cargo quickly and cheaply to the brink of space. D．It is a major milestone in the journey of making a new type of very fast airplanes.
It goes slower than a rocket. It extracts oxygen from the air that flows through the engine. It works only at speeds greater than five times the speed of sound. It doesn’t carry its own oxygen supply.
It goes slower than a rocket. It extracts oxygen from the air that flows through the engine. It works only at speeds greater than five times the speed of sound. It doesn’t carry its own oxygen supply.
It indicated the birth of a very fast airplane. It was self-powered, so it lasted only 11 seconds. It can transport cargo quickly and cheaply to the brink of space. It is a major milestone in the journey of making a new type of very fast airplanes.
Cryosat - 2 is one of the seven sapcecraft in Esa’s Earth Explorer programme. Cryosat -2 will be lofted into the space in the middle of next year. Goca will be launched after Cryosat -2. Cryosat -2 will be lofted in to the space by a new Vega rocket
hot gas rushes out of its head. it is powered by gas. hot gas rushes out of its bottom. hot gas rushes out of its neck.
The satellite has riot gone through the final check. There are something wrong with the satellite. There are many other satellites waiting to be launched before Cryosat -2. There are something wrong with the rocket.
it was the first air-breathing jet plane. it flew along the equator. it flew at speeds smaller than five times the speed of sound. it traveled at a supersonic speed.
It causes a lot of trouble to the project. They can make use of the extra time to do more preparation. It is resulted from the poor arrangement with the Russian - Ukrainian Dnepr rocket. It is resulted from their delayed final check.
It indicated the birth of a very fast airplane. It was self-powered, so it lasted only 11 seconds. It can transportcargo quickly and cheaply to the brink of space. It is a major milestone in the journey of making a new type of very fast airplanes.
it was the first air-breathing jet plane it flew along the equator it flew at speeds smaller than five times the speed of sound it traveled at a supersonic speed
A jet engine that gets oxygen from the air. A scramjet engine that doesn’t carry its own oxygen supply. A rocket engine that carries its own supply of oxygen. A jet engine that uses no oxygen.
It goes slower than a rocket. It extracts oxygen from the air that flows through the engine. It works only at speeds greater than five times the speed of sound. It doesn’t carry its own oxygen supply.
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