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  3. What fuels does the rocket thruster use? What is the crucial requirement on the rockets of lunar lander engines?

What fuels does the rocket thruster use? What is the crucial requirement on the rockets of lunar lander engines?

admin2009-06-24  50
问题 What fuels does the rocket thruster use?
What is the crucial requirement on the rockets of lunar lander engines?
选项 A、They must use liquid fuels.
B、They must be able to land on and take off from the moon.
C、They must be able to shut down the engines when necessary.
D、They must be able to steer spacecrafts.
答案A
解析
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