the propeller diameter
the propeller radius
the pitch angle
the length of helix
第1题：
Compared to a constant pitch propeller, a controllable pitch propeller
A.more efficiently uses available engine power
B.operates at a lower efficiency at a fixed speed
C.produces the same torque at lower engine power
D.develops its rated power at a lower speed
第2题：
Pitch is produced by frequency of vibration of the vocal cords. The higher the frequency, the higher the pitch.（）
A对
B错
第3题：
Propeller pitch speed minus ship speed divided by the propeller pitch speed is termed ___.
A.apparent slip
B.true slip
C.pitch
D.propulsive efficiency
第4题：
pitch
第5题：
音高（Pitch）
第6题：
_____ 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
第7题：
音名（Pitch name）
第8题：
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
第9题：
Pitch is produced by frequency of vibration of the vocal cords. The higher the frequency, the higher the pitch.（）
第10题：
当正副驾驶的姿态、指示，即俯仰、翻滚、指示相差5度时（）。