Whereas a ramjet generally cannot achieve high speeds without the initial assistance of a rocket, high speeds can be attained by scramjets, or supersonic combustion ramjets, in that they reduce airflow compression at the entrance of the engine and letting air pass through at supersonic speeds.
-
A high speeds can be attained by scramjets, or supersonic combustion ramjets, in that they reduce
分析该选项
-
Bthat high speeds can be attained by scramjets, or supersonic combustion ramjets, is a result of their reducing
分析该选项
-
Cthe ability of scramjets, or supersonic combustion ramjets, to achieve high speeds is because they reduce
分析该选项
-
Dscramjets, or supersonic combustion ramjets, have the ability of attaining high speeds when reducing
分析该选项
-
Escramjets, or supersonic combustion ramjets, can attain high speeds by reducing
分析该选项
显示答案
正确答案: E