2. 职称英语
  3. AIn the liquid-fuel rocket, the purpose of the valves Bis control the flow of th

AIn the liquid-fuel rocket, the purpose of the valves Bis control the flow of th

游客2024-01-02  54
问题 AIn the liquid-fuel rocket, the purpose of the valves Bis control the flow of the propellants, enabling the engine Cto work at different degrees Dof power.
选项 A、 
B、 
C、 
D、 
答案 B
解析 Is control is an incorrect structure. An infinitive is needed after the purpose of the valves is. Correction: is to control.
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