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

If the program is stored entirely in an external EPROM, what voltage must be applied to the /EA PIN on the 8051? （ ） A: 0 volts B: +10 volts--------------------------------------------------------------------------------------------------------------------------------- C: +5 volts D: -10 volts

Electromotive force (EMF) is measured in volts .

FANUC control system works under a _________volts voltage.

What is the unit of current A: kvp B: Ohms C: Volts D: Amperage

A nonlinear device Z has the i-v relationship shown below.This device is used in the circuit shown below, where "I" is the value of the current source.Assuming that \(I=$I1 A\), what is the value of the voltage \(v_o\) (in Volts)?Now assuming that \(I = $I2 A\), what is the value of the voltage \(v_o\) (in Volts)?Finally, for the last two parts assume that \(I = $I34 A\).What is the value of the voltage \(v_o\) (in Volts)?<br/>______

当COS5020G示波器屏幕上的波形接近稳定时，再调节（）旋钮，很可能将波形稳定下来。 A: 电平 B: TIME/DIV C: CH1的VOLTS/DIV D: CH2的VOLTS/DIV

A nonlinear device Z has the i-v relationship shown below.This device is used in the circuit shown below, where "I" is the value of the current source.Assuming that \(I=$I1 A\), what is the value of the voltage \(v_o\) (in Volts)?Now assuming that \(I = $I2 A\), what is the value of the voltage \(v_o\) (in Volts)?<br/>______

现对模拟示波器CH1通道VOLTS/DIV旋钮的“1V”挡位进行校准。接入方波校准信号后，CH1的VOLTS/DIV旋钮置“1V”，调节（ ），使方波在Y向上占两大格。（ ）

对称三相电源作星形连接，若已知UB＝220/60°，则UAB＝（） A: 220∠－150° B: 220∠－150° C: 220∠150° D: 220/∠－150°