_____ of the controllable pitch propeller enables the blades to be moved to change the pitch angle

A．An external mechanism

B．An internal mechanism

C．An interlock device

D．A hunting gear system

[单选题]A． controllable pitch propeller on a diesel driven vessel eliminates the need forA．friction clutchesB．disconnect clutchesC．reversing gearsD．reduction gears

[名词解释] pitch

[名词解释] 音高（Pitch）

[名词解释] 音名（Pitch name）

[单选题]C．ompared to a constant pitch propeller, a controllable pitch propellerA．more efficiently uses available engine powerB．operates at a lower efficiency at a fixed speedC．produces the same torque at lower engine powerD．develops its rated power at a lowe

[单选题]A variable pitch propeller is made （） a boss with separate blades mounted into it.A . ofB . up ofC . fromD . out

[主观题]A．n elevator pitch or named elevator speech or statement refers to such a talk as a speaker, like a salesman, tries to present a valuable idea to the listener in an elevator.()

[单选题]Propeller pitch speed minus ship speed divided by the propeller pitch speed is termedA．apparent slipB．true slipC．pitchD．propulsive efficiency

[单选题]Propeller pitch speed minus ship speed divided by the propeller pitch speed is termed ___.A．apparent slipB．true slipC．pitchD．propulsive efficiency

[单选题]在国标中规定使用“pitch angle”来表示。（）。A . 浆距角B . 倾角C . 安装角D . 偏航角