It is only when the correct voltages are applied to the A/C amplifier from the key inputs that the primary output (the A/C compressor relay) will be energised.

只有A/C扩大器上的电压是来自输入端的正确电压时，初级输出（即A/C压缩机继电器）才会被激活开启。

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Introduction was made to the key test items and technical requirements of contactor type relay reliability research.

介绍了接触器式继电器町靠性研究的重点试验项目及技术要求。

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The key points of condition-based maintenance of relay protection are state diagnosis, state assessment and maintenance decision-making method.

继电保护状态维修的关键是状态诊断、状态评估以及维修决策方法。

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Going forward, the LLCD will play a vital part in NASA's 2017 Laser Communications Relay Demonstration, a key test of laser-based relay comms in future missions.

ENGADGET

Another firefighter is stationed at a key point to relay messages to the teams above.

CNN: workers

He is respected both as an individual 400m runner and a key team member of the 4 x 400m relay.

BBC: Roger Black MBE