Class hierarchy showing violation of Open Closed principle.
违反开发闭合原则的类结构。
Based on "competitive product design first class of service satisfied first" principle.
本着“精品设计、优质服务、满意第一”的原则。
The Single Responsibility Principle: a class should have only one reason to change.
一个类应该有且只有一个改变的理由。
Principle and class of active power factor correction(APFC) are introduced.
主要介绍了有源功率因数校正（APFC）的工作原理、电路分类。
This curriculum advance class is the equipment and the accounting principle.
该课程的先行课是设备与会计原理。
Result: Be able to validate the principle of design taught in theory class.
结果验证理论课上所讲的设计原理。
Customer is God, to provide first-class products, first class service is our principle of service.
顾客就是上帝、为客户提供一流的产品，一流的服务是我们的服务宗旨。
Customer is God, to provide first-class products, first class service is our principle of service.
顾客就是上帝、为客户提供一流的产品，一流的服务是我们的服务宗旨。
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