Arrester should be in the thunderstorm season after a year to conduct a preventive test.

避雷器每年应在雷雨季节前后进行一次预防性试验。

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For this problem, the paper puts forward a way of doing preventive test without disconnection.

针对这一问题，提出采用不拆头方法做预防性试验。

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The judgment of transformer insulation condition, which is based on preventive test and DGA, has played an important role of accident prevention for a long time.

长期以来，根据预防性试验和油中溶解气体的气相色谱分析结果判断变压器的绝缘状况，对防止事故的发生起到了很大作用。

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Their preventive role also makes them difficult to test.

ECONOMIST: An ounce of prevention . . . | The

The Peripheral Artery Disease Coalition of more than 50 organizations endorses ABI screening, and is lobbying the federal Preventive Services Task Force to review the test with the aim of getting it covered more widely by Medicare.

WSJ: Peripheral Artery Disease (PAD) - When Achy Legs Are a Warning

In 2005, the CDC recommended that if a women arrives in labor in the emergency room and has not had prenatal care, a rapid, 20-minute test for HIV should be done so preventive treatment can be started immediately.

CNN: Prevention can mean no babies with HIV