该装置设计了开环和闭环两种可切换的工作方式。

It can work on open mode or the circular mode.

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设计方案分为两步：开环测试和闭环测试。

The scheme have two step: open loop test and closed loop test.

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设计方案分为两步：开环测试和闭环测试。

The scheme have two step: open loop test and closed loop test.

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