CASIO卡西欧 fx-50FH II 科学计算器电池更换

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CASIO fx-50FH II Scientific Calculator Battery Replacement: crwdns2935265:00crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

Inspect the battery compartment any alkaline residue.
If no residue is present, skip to Step 7.

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