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干旱开关：自动关机和报警时，供水中断，保护泵。
Drought Switch: Automatic shutdown and alarm when water supply is interrupted to protect the pump.
youdao
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是实现自动警和停机的一种保护性开关。
It is a protective switch to realize automatic alarm and stop.
youdao
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是实现自动警和停机的一种保护性开关。
It is a protective switch to realize automatic alarm and stop.
youdao