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【单选题】
要使输出电压稳定又具有较高的输入电阻,放大器应引 入负反馈。 A )电压串联负反馈 B )电流串联负反馈 C )电压并联负反馈 D )电流并联负反馈A.
B.
C.
D.
D
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举一反三
【单选题】The star of David, an important religious symbol, was transformed a badge of shame by Nazis.
A.
in; a
B.
into; a
C.
into; the
D.
in; the
【简答题】根据中国标准化法，中国标准分为国家标准、_______、______和企业标准4类。
【单选题】Where does Annemarie keep Ellen's Star of David necklace until the end of the war?
A.
She wears it.
B.
In the closet.
C.
In the pocket of Lise's dress.
D.
In her jewelry box.
【简答题】吸附法制备固定化酶的原理及特点 ?
【单选题】Where did Annemarie hide The Star Of David?
A.
Under her bed
B.
She gave it to Kirsti
C.
In one of the House Cabinets
D.
In the pocket of Lise's Yellow Dress
【多选题】Which of the following are NOT true about David Beckham?
A.
never married
B.
professionally unsuccessful
C.
English football player
D.
international soccer star
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