The apparent wind can be zero when the true wind is from（）.<br>A:ahead and equal to the ship's speed<br>B:astern and equal to the ship's speed<br>C:ahead and equal to twice the ship's speed<br>D:astern and equal to twice the ship's speed

The apparent wind can be zero when the true wind is from（）.
A:ahead and equal to the ship's speed
B:astern and equal to the ship's speed
C:ahead and equal to twice the ship's speed
D:astern and equal to twice the ship's speed

出自：海船船员证

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