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In a circuit with resistance and capacitance, if the frequency of the current increases from 50 Hz to 100 Hz, how will the impedance of the circuit change?
In a circuit with resistance and capacitance, if the frequency of the current increases from 50 Hz to 100 Hz, how will the impedance of the circuit change?A . IncreaseB . ReduceC . No changeD . UncertainView AnswerAnswer: B
Which of the following is correct about the upward supply and downward return air supply method?
Which of the following is correct about the upward supply and downward return air supply method?A . The air supply outlet is located at the upper part of the air-conditioned room, and the air return outlet is located at the lower part of the air-conditioned room.B . NoneView AnswerAnswer: A
Which of the following interfaces can both power the device and have communication functions?
Which of the following interfaces can both power the device and have communication functions?A . RJ45B . RJ12C . FED . POEView AnswerAnswer: D
Which of the following components is a fire detector that detects smoke particles?
Which of the following components is a fire detector that detects smoke particles?A . Heat DetectorB . Pressure switchC . Smoke detectorD . Sound and light alarmView AnswerAnswer: C
Which of the following components can check whether the refrigerant contains moisture?
Which of the following components can check whether the refrigerant contains moisture?A . Solenoid valveB . Sight glassC . Filter drierD . Oil sight glassView AnswerAnswer: B
Which of the following does not belong to the integrated wiring system?
Which of the following does not belong to the integrated wiring system?A . Raised FloorB . Fiber OpticC . Cable TrayD . Patch PanelView AnswerAnswer: A
Which of the following descriptions of lithium-ion battery separator is wrong?
Which of the following descriptions of lithium-ion battery separator is wrong?A . Allow lithium ions to pass through.B . Allow electrons to pass through.C . Contains micropores that can absorb electrolyte.D . The thicker the isolation film, the better its strength and safety, but the battery cell energy density is...
Which of the following parameters can reflect the energy efficiency status and energy efficiency of a data center?
Which of the following parameters can reflect the energy efficiency status and energy efficiency of a data center?A . ROIB . PUEC . MTTFD . SPCView AnswerAnswer: B
When electrolyte leakage occurs in the battery, () treatment method is more appropriate.
When electrolyte leakage occurs in the battery, () treatment method is more appropriate.A . Wear gloves and wipe it clean with a rag, and check whether it needs to be replacedB . No other optionsView AnswerAnswer: A
MCB circuit breakers can be divided into B, C, D, Z, and K levels according to different tripping characteristics. Which level of tripping characteristics should be used for IT loads?
MCB circuit breakers can be divided into B, C, D, Z, and K levels according to different tripping characteristics. Which level of tripping characteristics should be used for IT loads?A . B levelB . C-levelC . D levelD . Z levelView AnswerAnswer: B
