After the NetCol5000-A25kW half-cabinet air-conditioning refrigerant pipeline is installed, do the nitrogen charge pressure maintaining, the nitrogen pressure is () Mpa.

• A.2
• B.2.5
• C.3
• D.0.8

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When the device interface uses the Modbus-RTU protocol, what needs to be installed when accessing the ECC800?

• A.ETH converter
• B.Access control actuator
• C.sunroof actuator
• D.AC actuator

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Which of the following options is a natural cooling system?

• A.Water-cooled cold air conditioning system
• B.Direct ventilation air conditioning system
• C.Air-cooled direct expansion air conditioning system
• D.Water-cooled cold water air conditioning system

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Which of the following are the characteristics of Huawei NetCol5000-A row-level precision air conditioner cooling capacity adjustment?

• A.Invariable frequency compressor, can't adjust cooling capacity infinitely.
• B.DC inverter compressor, which can 20%~100% infinitely adjust cooling capacity.
• C.When the load is lower than 30%, the compressor starts and stops frequently, and the valve frequently actions and is easily stuck.
• D.When the load is lower than 20%, the electric heating heat compensation is turned on, and the compressor is continuously operated without stopping.

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At present, the industry PUE value can be optimally achieved ( ).

• A.0.5
• B.2
• C.-0.5
• D.1.06

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