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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Information in a biological passport can help catch athletes who use banned drugs but find ways to avoid testing positive for them.

VOA: special.2011.04.12

The singer said the testing shows that she is,in her words, borderline positive for the disease.

VOA: special.2010.06.15

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

In a study of 150 melanoma patients, 95% of those testing positive for melastatin stayed in remission for four years, versus half of those testing negative.

FORBES: Divining Disease

If one in 1, 000 people have a disease and the false-positive rate for a test is 5%, then the probability that a person testing positive has the disease is at most 2%.

ECONOMIST: Letters | The

Hudson was sacked by his previous club Bradford after testing positive for the banned steroid stanozolol.

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