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继电器控制 [jì diàn qì kòng zhì]
relay control
- PC源于基于继电器的控制系统。
PCs historically originate in relay-based control systems. - 点焊时间由数显时间继电器控制，精度0.01秒。
Spot-welding time is controlled by figure-showing time relay, and the accuracy is 0.01 second. - 国工局认为可能是自动继电器控制系统故障所引起的。
The National Expressway Engineering Bureau said that the problem may have all occured when the transformer's automatic control system broke down.
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