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(单选题)

The difference between Fixed pitch propeller (FPP) and Controllable pitch propeller (CPP) is in that()

Afor FP, once fitted, the position of the blades can also be changed in operation

Bfor CP, once fitted, the position of the blades can also be changed in operation

Cthe CP type has a relatively smaller hub compared with the FP propellers

Dthe FP type has a relatively larger hub compared with the CP propellers

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