单选题On what does the operation of an aneroid barometer depend?（）AThin，metal，air tight cellBCurved tube containing alcoholCColumn of mercury supported by atmospheric pressureDExpansion of mercury in a closed tube
单选题
On what does the operation of an aneroid barometer depend?（）
A
Thin，metal，air tight cell
B
Curved tube containing alcohol
C
Column of mercury supported by atmospheric pressure
D
Expansion of mercury in a closed tube
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