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

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

admin2009-06-24  39
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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