单选题Compared to a constant pitch propeller, a controllable pitch propeller（）.Amore efficiently uses available engine powerBoperates at a lower efficiency at a fixed speedCproduces the same torque at lower engine powerDdevelops its rated power at a lower speed
单选题
Compared to a constant pitch propeller, a controllable pitch propeller（）.
A
more efficiently uses available engine power
B
operates at a lower efficiency at a fixed speed
C
produces the same torque at lower engine power
D
develops its rated power at a lower speed
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