As a ship moves through the water，it drags with it a body of water called the wake. The ratio of the wake speed to the ship’s speed is called（）.<br>A:propeller velocity<br>B:speed of advance<br>C:wake distribution<br>D:wake fraction

As a ship moves through the water，it drags with it a body of water called the wake. The ratio of the wake speed to the ship’s speed is called（）.
A:propeller velocity
B:speed of advance
C:wake distribution
D:wake fraction

出自：海船船员证

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