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单选题
751.When an airplane is designed to fly at lower speeds, the turboprop is usually the engine chosen ( )
A
When an airplane is designed to fly at lower speeds, the turboprop is usually the engine choose.
B
The turboprop engine is usually chosen to be installed on the airplane which is designed to fly at lower speed.
C
When an airplane is designed to fly at lower speeds, the piston propeller engine is usually chosen
答案解析
正确答案：B
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