This paper starts from source and harm of harmonics, continues with the principle and structure of APF, and a comparison of several harmonic detection and control methods.
本文从谐波的危害和产生入手，先介绍了有源滤波器的原理及结构，然后对有源滤波器的谐波检测和控制方法做出分析比较。
The article briefs the source and harm of beta-lactam antibiotic in milk. The article also provides information for improvement on the methods of determination and quality of milk and milk products.
介绍了牛奶中青霉素类抗生素残留的来源、危害，并对在牛奶中常见的青霉素类抗生素的检测方法进行了阐述，对于改进实验方法和提高奶及奶制品质量都有一定的借鉴作用。
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