单选题Prior to reading an aneroid barometer，you should tap the face lightly with your finger to（）.Aexpose any loose connectionsBdemagnetize the metal elementsCbring the pointer to its true positionDcontract and expand the glass face
单选题
Prior to reading an aneroid barometer，you should tap the face lightly with your finger to（）.
A
expose any loose connections
B
demagnetize the metal elements
C
bring the pointer to its true position
D
contract and expand the glass face
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