Access control system can only set whether the user can open the door, can not be set when to open
the door.
B
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.
A
What throttle devices does Huawei air-cooled precision air conditioning use? (Multiple choice)
B, C
When using PoE (Power over Ethernet) interface, it has two functions: communication and power
supply.
A
The main monitoring objects of data center room monitoring system are power systems,
environmental systems, fire protection systems etc.
A
In the main inverter modeT the inverter will change from main inverter to battery inverter mode
when overloaded.
B
When the sunroof actuator senses a smoke alarmr it can not control the flip sunroof to open
automatically.
B
Cryogenic components improve the continuous low pressure caused by low temperature start-up,
thus allowing the air conditioner to start up normally.
A
Gas fire protection systems are fire extinguishing systems that inject gas (including steam, aerosol) as
a fire extinguishing medium.
A