單項(xiàng)選擇題

(2010)某晶體管放大電路的空載放大倍數(shù)Ak=-80、輸入電阻ri=1kΩ和輸出電阻ro=3kΩ,將信號(hào)源(uS=10sinwtmV,RS=1kΩ)和負(fù)載(RL=5kΩ)接于該放大電路之后(見(jiàn)圖),負(fù)載電壓uo將為:()

A.-0.8sinwtV
B.-0.5sinwtV
C.-0.4sinwtV
D.-0.25sinwtV