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The difference between Fixed pitch propeller (FPP) and Controllable pitch propeller (CPP) is in that（）
A:for FP, once fitted, the position of the blades can also be changed in operation
B:for CP, once fitted, the position of the blades can also be changed in operation
C:the CP type has a relatively smaller hub compared with the FP propellers
D:the FP type has a relatively larger hub compared with the CP propellers

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出自：海船船员证

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