There are two identical batteries in series, which statement is true?( ) A: The total voltage equals the sum of the voltages of each battery. B: The total voltage equals any battery voltage. C: The total voltage equals half of one battery voltage

Identify the feed back type. ( ).[img=682x460]1803c60dfb191b0.jpg[/img] A: Series Voltage Negative B: Series Current Negative C: ParallelVoltageNegative D: ParallelCurrentNegative

For a neutral-unearthing system, during a bolted single line-to-ground fault, the non-fault phase voltage and the fault phase voltage are ()respectively. A: phase voltage and zero B: phase voltage and line-to-line voltage C: line-to-line voltage and phase voltage D: line-to-line voltage and zero

在电阻串联电路中，如果某一个电阻开路，则（ ）In a series resistive circuit, if a resistance is open, ( ) A: 总电流为0 the total current is 0 B: 总电阻为∞，the total resistance is ∞ C: 开路处的电压等于电源电压the opened-resistor voltage is equal to the supply voltage D: 开路处的电压等于0 the opened-resistor voltage is equal to 0

In previous simulation and on-site experiment, where is the voltage difference between the source voltage and the load 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

The time series is mainly divided into absolute number time series, relative number time series and ( ). A: Period series B: Time-point series C: Chronological series D: Average time series

如果定义函数计算调和级数之和;series::Int-Float用series n表示[img=242x25]1803c461290438b.png[/img]，那么如何用series 表示[img=191x25]1803c46130ff710.png[/img]？ A: series n-1 B: series (n-1) C: series 1 + series 2 + ... + series (n-1) D: series (1+1/2+..+ 1/n-1)

In binary positive logic systems，1 is represented by the voltage, and is represented by the lower voltage level.

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