名词解释题音高(Pitch)

名词解释题
音高(Pitch)

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

Compared 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 lower speed

_____ 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

声调的音高有时是相对音高,有时则是绝对音高。()

关于音高表述错误的是A.声音的频率不是决定音高的唯一因素,声音的音高也随强度的改变而改变B.对于低音来说,音高随强度增加而降低C.对于高音来说,音高隧强度增加而升高D.中等频率的声音的音高受强度的影响较小,随着强度的增加,音高先降后增

“他说话声音高,真可以说是声如洪钟”的“声音高”是指音高。A对B错

Pitch is produced by frequency of vibration of the vocal cords. The higher the frequency, the higher the pitch.()A对B错

音名(Pitch name)

The most powerful signal of stress is a change of pitch on the vowel.()

pitch()A、倾斜B、横摇C、转变D、纵摇

音高(Pitch)

Pitch is produced by frequency of vibration of the vocal cords. The higher the frequency, the higher the pitch.()

宫音阶只有相对音高,没有绝对音高。

pitch

乐音体系中的等音是()。A、音高同、名称异B、音高名称相同C、音高名称不同D、音高异、名称同

当正副驾驶的姿态、指示,即俯仰、翻滚、指示相差5度时()。A、PITCH显示在PFD左侧,ROLL显示在PFD右侧B、只显示PITCH在PFD上C、只显示ROLL在PFD上D、PITCH显示在PFD右侧,ROLL显示在PFD左侧

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

单选题Which characteristic is a disadvantage of a controllable- pitch propeller as compared to a fixed-pitch propeller? ()ASlightly higher fuel consumptionBLack of directional control when backingCInefficient at high shaft RPMDSome unusual handling characteristics

单选题乐音体系中的等音是()。A音高同、名称异B音高名称相同C音高名称不同D音高异、名称同

单选题() is made of a boss with separated blades mounted into it.AA variable pitch propellerBA variable pitch nutCA fixed pitch parallelDA fixed pitch screw

名词解释题pitch

单选题Propeller pitch speed minus ship speed divided by the propeller pitch speed is termed ().Aapparent slipBtree slipCpitchDpropulsive efficiency

名词解释题音名(Pitch name)

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The pitch ratio of a propeller is the mean pitch divided by ().Athe propeller diameterBthe propeller radiusCthe pitch angleDthe length of helix

单选题For vessels with (), the meaning of the order would include the combination of pitch and revolutions as indicated in ships orders.Afixed pitch propellersBuncontrollable pitch propellerCconstant pitch propellersDvariable pitch propellers

单选题By which of the following means is force efficiently provided to vary the pitch of the blades on a modem controllable pitch propeller?()AHydraulicBMechanicalCPneumaticDElectrical