单选题The purpose of the “set” hand on an aneroid barometer is to（）.Aadjust the barometerBindicate any change in the reading of the barometerCprovide a correction for height above sea levelDprovide a correction for temperature changes
单选题
The purpose of the “set” hand on an aneroid barometer is to（）.
A
adjust the barometer
B
indicate any change in the reading of the barometer
C
provide a correction for height above sea level
D
provide a correction for temperature changes
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