The stationery and printing company S Co, has recently upgraded its computers and printers so thatmore production has become automated. Many middle managers will now be made redundant. This is known a
A. Downsizing
B. Delayering
C. Outsourcing
Downsizing
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功率放大电路的转换效率是指()
A. 输出功率与晶体管消耗的功率之比
B. 晶体管消耗的功率与电源提供的平均功率之比
C. 输出功率与电源提供的平均功率之比
D. 输出功率与电源提供的直流功率之比
Which of the following socio-cultural trends will have a direct impact on most business organisations?(i) Increasing ethnic and religious diversity in populations(ii) Falling birthrates(iii) Focus on
A. (iii) only
B. (i) and (iii) only
C. (i), (ii) and (iii) only
D. (i), (ii), (iii) and (iv)
下面对三极管错误的描述是()
A. 双极型晶体管在集电极和发射极互换使用时,没有电流放大作用
B. 在选用管子时,一般希望晶体管的穿透电流ICEO尽量小
C. 三极管属于电流控制型器件,多子和少子都参与导电
D. 温度升高时,三极管的电流放大系数β、反向饱和电流ICBO和发射结正偏电压UBE均变大
某放大电路在负载开路时的输出电压为4V,接入3kΩ的负载电阻后输出电压降为3V。则说明放大电路的输出电阻为()
A. 10kΩ
B. 2kΩ
C. 1kΩ
D. 0.5kΩ