总的退款金额将冲抵你的第一个购买添加专业，这笔退款只能使用一次。
The total refund amount will be offset against your first purchase in VRC PRO, this refund can only be used once.
预置5 -权力的帐户-计算总单位使用的基础上抄表，有多少天在结算期及总金额，由于包括维修费。
Preset 5 - Power Account - Calculates the total units used based on meter readings, the number days in the billing period and the total amount owing including maintenance charges.
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