The refrigerant air cylinder of the Huawei air-cooled air conditioner does not need to be inverted on the electronic scale when charging the refrigerant.

If the customer load cannot be power-off, what should be taken care when closing the maintenance bypass switch? (Multiple choice)

When the FusionModule1000 fire protection system is adjusted, the smoke detector can be heated to simulate the fire alarm of the temperature sensor.

Before the UPS5000 is powered on, it is necessary to check that the UPS input switch, bypass switch, output switch, maintenance bypass switch, battery open) have all been placed in the "OFF" state.

When the unit is working, the load of the UPS2000-G is connected to the PL, what condition will cause the load to be de-energized? (Multiple choice)