音高（Pitch）
音高（Pitch）
相关考题：
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
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
Pitch is produced by frequency of vibration of the vocal cords. The higher the frequency, the higher the pitch.（）A对B错
Pitch is produced by frequency of vibration of the vocal cords. The higher the frequency, the higher the pitch.（）
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
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（） is made of a boss with separated blades mounted into it.AA variable pitch propellerBA variable pitch nutCA fixed pitch parallelDA fixed pitch screw
单选题Propeller pitch speed minus ship speed divided by the propeller pitch speed is termed （）.Aapparent slipBtree slipCpitchDpropulsive efficiency
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