... 电能测量 付费系统 第31部分：特殊要求 静止式付费有功电能表(1和2级) 英文名称： Electricity metering - Payment systems - Part 31: Particular requirements - Static payment meters for active energy (c..
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付费系统本身是一种很成熟的后勤基础结构组件。
Billing systems themselves are a well-understood back-office infrastructure component.
网上购物的流行得益于因特网，网上付费系统和送货服务的完善。
Online shopping is getting more and more popular thanks to the improvement of the Internet, online payment syetems and delivery services.
预付费系统节省了运营商发送账单以及追索债务的费用。
Prepaid billing saves operators sending out bills and chasing up debts.
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