In the power supply and distribution system of a data center, for which purpose is a low-voltage circuit breaker with three-stage protection characteristics used? (Multiple choice)

For unsaturated air, the relationship between dry bulb temperature, wet bulb temperature and point A temperature is ()

In the process of construction, carry out the debris splash operation, should use ().

When an air-cooled direct expansion air conditioner is performing normal cooling operation, the condenser inlet temperature is higher than the outdoor temperature.

What functions can the dynamic environment monitoring system achieve? (Multiple choice)