There are two design methods: analog mode and digital mode.
开发了两种设计方案：数字式和模拟式。
If two of the digital computers failed, the flight control system switched to the analog mode.
如果数字计算机两次失败，飞行控制系统切换到模拟模式。
The communication of substation secondary circuit is being transformed from metal cable analog mode to optic-electric digital mode.
变电站二次回路通信从金属电缆模拟通信方式逐步转变为光电数字化通信方式。
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