单选题Which characteristic is a disadvantage of a controllable- pitch propeller as compared to a fixed-pitch propeller? （）ASlightly higher fuel consumptionBLack of directional control when backingCInefficient at high shaft RPMDSome unusual handling characteristics
单选题
Which characteristic is a disadvantage of a controllable- pitch propeller as compared to a fixed-pitch propeller? （）
A
Slightly higher fuel consumption
B
Lack of directional control when backing
C
Inefficient at high shaft RPM
D
Some unusual handling characteristics
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