在双电源互补对称功放电路中,若最大输出功率为1W,则电路中功率管的最大功耗为()
A. 1 W
B. 0.5 W
C. 0.2 W
D. 0.1 W
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功率放大电路与电压放大电路、电流放大电路的共同点是()
A. 都使输出电压大于输入电压
B. 都使输出电流大于输入电流
C. 都使输出功率大于信号源提供的输入功率
D. 都要考虑电路的输出功率问题
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
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)