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
The following air conditioning, which is comfort air conditioning?
C
12V battery consists of 6 2V battery cells.
A
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.
B
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
engine
room
should be near the ground repeatedly.
A
The following () options belong to water-cooled chilled water air conditioners. (Multiple choice)
C, D