A sling psychrometer is a(n)（）.<br>A:type of cargo gear<br>B:instrument used in celestial navigation<br>C:instrument used to measure relative humidity<br>D:instrument used to measure specific gravity

A sling psychrometer is a(n)（）.
A:type of cargo gear
B:instrument used in celestial navigation
C:instrument used to measure relative humidity
D:instrument used to measure specific gravity

出自：海船船员证

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