Which of these is not an electrical quantity（）
A: time
B: voltage
C: current
D: power
A: time
B: voltage
C: current
D: power
举一反三
- The<br/>common-base amplifier has _()()()__. A: voltage gain, current gain, and power gain B: voltage gain and power gain, but no current gain C: current gain and power gain, but no voltage gain D: current gain and voltage gain, but no power gain
- The function of direct current regulated power supply is to input an alternating current power of 220volts, so that it can output __________.( ) A: alternating current 200 volts voltage B: direct current 24 volts voltage C: direct current 200 volts voltage D: alternating current 24 volts voltage
- The voltage meter and current meter on the main switchboard shows ( <br/>). A: phase voltage and phase current of generator B: line voltage and line current of generator C: line voltage and line current of crane D: line voltage and line current of shore power
- Which parameter is not measured by DPO-2002B double-channel oscilloscope? A: current B: voltage C: cycle time D: frequency
- ( ) is not the index of power quality. A: voltage B: current C: frequency D: waveform