Access control system can only set whether the user can open the door, can not be set when to open
Whare are UPS common working modes? (Multiple choice)
A, B, C
R410a refrigerant in the moment of spray out, can frostbite human skin and deeper muscles in a very
short period of time and cause frostbited dermal necrosis.
What throttle devices does Huawei air-cooled precision air conditioning use? (Multiple choice)
When using PoE (Power over Ethernet) interface, it has two functions: communication and power
The main monitoring objects of data center room monitoring system are power systems,
environmental systems, fire protection systems etc.
In the main inverter modeT the inverter will change from main inverter to battery inverter mode
When the sunroof actuator senses a smoke alarmr it can not control the flip sunroof to open
Cryogenic components improve the continuous low pressure caused by low temperature start-up,
thus allowing the air conditioner to start up normally.
Gas fire protection systems are fire extinguishing systems that inject gas (including steam, aerosol) as
a fire extinguishing medium.
The following air conditioning, which is comfort air conditioning?
12V battery consists of 6 2V battery cells.
In Main Inverter mode, the UPS will switch from Main Inverter mode to Static Bypass mode when
mains input voltage and frequency exceed the allowable range of the UPS.
When AC power equipment are introduced in by using three-phase four-wire system, in addition to
the zero line on the near side of the power transformer grounding, electrical equipment and the
should be near the ground repeatedly.
The following () options belong to water-cooled chilled water air conditioners. (Multiple choice)