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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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单选题On what does the operation of an aneroid barometer depend?（）A
Thin，metal，air tight cellB
Curved tube containing alcoholC
Column of mercury supported by atmospheric pressureD
Expansion of mercury in a closed tube
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temperatureC
wind speedD
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单选题Prior to reading an aneroid barometer，you should tap the face lightly with your finger to（）.A
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demagnetize the metal elementsC
bring the pointer to its true positionD
contract and expand the glass face
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单选题The purpose of the “set” hand on an aneroid barometer is to（）.A
adjust the barometerB
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sling psychrometerB
microbarographC
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