Prior to reading an aneroid barometer，you should tap the face lightly with your finger to（）.<br>A:expose any loose connections<br>B:demagnetize the metal elements<br>C:bring the pointer to its true position<br>D:contract and expand the glass face

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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