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【多选题】
Which quotation below is an analogy?A.
Reading without reflecting is like eating without digesting. (—Edmund Burke)
B.
Potential is like a diamond in the rough. You know there is value, but it just needs to be polished first.
C.
Life is like a coin. You can spend it anyway you wish, but you can only spend it once.
D.
He has many mouths to feed in his family.
E.
Nature’s first green is gold / Her hardest hue to hold / Her early leaf’s a flower / But only so an hour. (—Robert Frost)
F.
We must all hang together , or we shall all hang separately.(—Benjamin Franklin)
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【简答题】如图所示共射放大电路, Rb=270kΩ , Rc= 3kΩ , Rs=500Ω , β=70 , VCC=12V ,晶体管为硅管。试求: ( 1 )电路的直流通路为 ,交流通路为 ,微变等效电路为 (只填写序号,去掉括号) ( 2 )放大电路的静态工作点,基极电流为 = uA,集电极电流 = mA,集电极发射极电压为 = V。(先选择表达式的序号,再填写计算结果小数) (3)放大电路的动态性能指...