A． controllable pitch propeller on a diesel driven vessel eliminates the need for

A．friction clutches

B．disconnect clutches

C．reversing gears

D．reduction gears

[单选题]_____ of the controllable pitch propeller enables the blades to be moved to change the pitch angleA．An external mechanismB．An internal mechanismC．An interlock deviceD．A hunting gear system

[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

[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]The saying“He who dies rich, dies disgraced” properly means thatA． the wealthy people should give away their fortunes after deathB． the wealthy people should feel ashamed for their assetsC． the wealthy people should abandon their careers for charitie

[名词解释] pitch

[名词解释] 音高（Pitch）

[单选题]Theoretical perfect combustion in a diesel engine yields by-products of_____.A．aldehydes and carbon dioxideB．water vapor and carbon monoxideC．nitrogen and carbon monoxideD．water vapor and carbon dioxide

[单选题]Theoretical perfect combustion in a diesel engine yields by-products of （）.A . aldehydes and carbon dioxideB . water vapor and carbon monoxideC . nitrogen and carbon monoxideD . water vapor and carbon dioxide