音高（Pitch）

[名词解释] pitch

[名词解释] 音名（Pitch name）

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

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

[判断题]声调的音高有时是相对音高，有时则是绝对音高。()A.对B.错

[判断题]声调的音高有时是相对音高，有时则是绝对音高。（）A.对B.错

[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.()

[名词解释] 音高