An instrument that indicates wind direction is known as a(n)（）.<br>A:weather vane，wind vane or wind sock<br>B:hydrometer<br>C:hygrometer<br>D:sling psychrometer

An instrument that indicates wind direction is known as a(n)（）.
A:weather vane，wind vane or wind sock
B:hydrometer
C:hygrometer
D:sling psychrometer

出自：海船船员证

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