Four, contactor, choose switch: Germany 'golden bell mill'.
接触器、选择开关：德国金钟穆勒。
The experiment shows that the intelligent contactor can realize network communication function.
实验表明，该智能接触器能实现网络通信功能。
The experiment shows that the intelligent contactor can realize network communication function.
实验表明，该智能接触器能实现网络通信功能。
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