【单选题】
A A.Reading is obtained by withdrawing measuring stick from tank and latching it magnetically to an internal float.
B B.Reading is obtained by withdrawing measuring stick from tank and latching it electrically to an internal float.
C C.Reading is obtained by withdrawing measuring stick from tank and latching it pneumatically to an internal float.
D D.Reading is obtained by withdrawing measuring stick from tank and latching it automatically to an internal float.
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