According to the loop principle, it puts forward the new concept of positive testing point and negative testing point. Combined with the examples, 5 basic test methods are introduced.

并根据简单的回路原则，提出了正检测点、负检测点的新概念，结合实例简述电路检测5种基本方法的使用和检测要领。

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With nearly eight percent of pregnant women in the capital testing HIV positive, preventing mother-to-child transmission is especially important.

VOA: standard.2009.04.24

To avoid beatings and abuse, women who think they may be HIV-positive may delay testing and diagnosis.

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Melky Cabrera and Bartolo Colon are both facing 50-game suspensions after testing positive for testosterone usage.

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Meanwhile, Sharks fly-half Herkie Kruger is facing a two-year ban after testing positive for the anabolic steroid nandrolone.

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