_____ of the controllable pitch propeller enables
_____ of the controllable pitch propeller enables the blades to be moved to change the pitch angle
A.An external mechanism
B.An internal mechanism
C.An interlock device
D.A hunting gear system
请帮忙给出正确答案和分析，谢谢！
参考解答
457***779
2024-06-14 20:45:37
正确答案：B
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