DC parameters test is an important method of IC test. It is one of the key means to ensure the performances and qualities of IC.

直流参数测试是集成电路测试的一种重要方法，是保证集成电路性能、质量的关键手段之一。

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Corona effect is one of the key issues of designing UHV transmission lines, in which the influence of temperature and humidity on DC conductor corona should be considered.

电晕效应是特高压输电线路设计中所考虑的关键题目之一，温度、湿度对直流导线电晕影响规律是特高压直流输电线路设计的依据。

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So, the key techniques for development of MOA domestics are correlation standards, making and test of elements for DC MOA, and the measurement of non-uniform current between multi-column arresters.

而相关标准及导则的制订，直流金属氧化物电阻片的制造与检验，多柱（或只）避雷器的电流分布测量是其国产化的关键。

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Key sites in Washington DC and New York have also seen security tightened.

BBC: Boston bombs: FBI probes deadly marathon 'terror' blasts

The best known extended-stay apartment hotel is AKA, which has nine locations in key markets throughout the US, including Philadelphia, Washington DC, Virginia and four in New York.

BBC: Apartment stays get hotel style