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【单选题】
场效应管放大电路与晶体三极管放大电路比较其最大的特点是（ ）。A.
电压放大能力强
B.
电流放大能力强
C.
带负载能力强
D.
输入电阻高
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举一反三
【单选题】(2013·江西九江二模)If you won't do as I tell you, you ________ get the chance to be promoted because the competition is just too fierce.
A.
couldn't
B.
mustn't
C.
shouldn't
D.
shan't
【单选题】．(2013·江西九江高三二模)________ around the university, we then were taken to a building, where many scientists worked.
A.
Showing
B.
Having been shown
C.
Being shown
D.
Having shown
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