单选题An instrument that indicates wind direction is known as a(n)（）.Aweather vane，wind vane or wind sockBhydrometerChygrometerDsling psychrometer
单选题
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
参考解析
解析：
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