We are #SpaceEnablers. We build the most reliable launch vehicles and we are developing Ariane 6. Get your space gear! 
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No. 3, of course!
Well, the first one includes some high pressure I guess, and the second one some fluids I think.
We need a more precise answer. 
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The sound is unforgettable, according to people who have experienced an Ariane 5 lifting off. But this week’s question should be really easy for experts like you! 
