Which characteristic is a disadvantage of a controllable- pitch propeller as compared to a fixed-pitch propeller? （）<br>A:Slightly higher fuel consumption<br>B:Lack of directional control when backing<br>C:Inefficient at high shaft RPM<br>D:Some unusual handling characteristics

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

出自：海船船员证

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