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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Monitoring results analysis of preventive test combined with the existing, and promote the equipment operation and maintenance to the better direction.

监测分析结果与现有的预防性试验结果分析相结合，推动设备运行维护方式向更优越的方向转变。

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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