The following ____________ Circuit breakers are usually used ITLow-voltage circuit breaker for the load.

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Protective grounding: Grounding refers to the direct connection with the earth, and a certain point of the live part of an electrical device or electrical circuit is connected to a large point. When the electrical device or other device is normal, a certain point of the uncharged part is artificially connected to the earth.

• A.True
• B.False

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The three major indicators of air conditioning are ____________ .

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The role of the safety valve in the battery structure prevents excessive internal pressure from being excessive
____________ exclude.

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UPS Also known as AC uninterrupted power supply system, for online upsWhen the AC input is normal, the
____________ will supply power to the system.

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