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 operationBfor CP, once fitted, the position of the blades can also be changed in operationCthe CP type has a relatively smaller hub compared with the FP propellersDthe FP type has a relatively larger hub compared with the CP propellers
单选题
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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