如由样品产生漏气和污染，我们建议测量系统需定期维护。
In case of outgassing or pollution caused by the specimen we recommend regular maintenance of the measuring system.
铁路安全继电器是铁路系统中的重要执行元件，必须定期对其电气特性进行测量。
The railway safety relay is an important executable component in railway system, whose electrical characteristics must be tested timely.
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