What fuels does the rocket thruster use? All of the following groups have test-fired methane/LOX engines except______.

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问题 What fuels does the rocket thruster use?
All of the following groups have test-fired methane/LOX engines except______.

选项 A、NASA engineers.
B、XCOR Aerospace.
C、Aurora Flight Systems.
D、Northrop Grumman aerospace company.

答案C

解析
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