问题

Compared to a constant pitch propeller

Compared to a constant pitch propeller, a controllable pitch propeller（）.

Amore efficiently uses available engine power
Boperates at a lower efficiency at a fixed speed
Cproduces the same torque at lower engine power
Ddevelops its rated power at a lower speed

参考答案

参考解析：

分类：船舶辅助机械题库

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