Pitch
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：
A.29
B.77
C.101
D.70
第3题：
A、Tune
B、Tone
C、Audio
D、Pitch
第4题：
The most powerful signal of stress is a change of pitch on the vowel.（）
第5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：
第8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9题：
音名（Pitch name）
第10题：
pitch（）