省到水電：Bal b/f TW$27,740+TW$365=TW$28,105 Bal c/f
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https://youtu.be/Uz7eFm_U1I4?si=Dnle1sFiZjyJ3BWH
https://youtu.be/1KLZ2dUtQzI?si=_dzOaUtaM4QSqz8-