The apparent wind’s speed can be zero only when two conditions are present. One condition is that the true wind（）.<br>A:must be from dead ahead<br>B:speed must be zero<br>C:must be from dead astern<br>D:must be on the beam

The apparent wind’s speed can be zero only when two conditions are present. One condition is that the true wind（）.
A:must be from dead ahead
B:speed must be zero
C:must be from dead astern
D:must be on the beam

出自：海船船员证

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