Domestic water pump is started automatically by （） which operates as the water level falls to a predetermined level.<br>A:a level controller<br>B:a temperature switch<br>C:a pressure switch<br>D:a floating ball

Domestic water pump is started automatically by （） which operates as the water level falls to a predetermined level.
A:a level controller
B:a temperature switch
C:a pressure switch
D:a floating ball

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