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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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单选题Which of the following is a disadvantage of RAID 10?（）A
Poor performanceB
No fault toleranceC
Not supported by many RAID controllersD
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