单选题A sling psychrometer is a(n)（）.Atype of cargo gearBinstrument used in celestial navigationCinstrument used to measure relative humidityDinstrument used to measure specific gravity
单选题
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
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