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【多选题】
用来衡量放大器性能的主要指标有A.
放大倍数
B.
输入电阻
C.
通频带
D.
输出电阻
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皮皮学刷刷变学霸
举一反三
【单选题】—Look! A book is on the floor. Whose is it? —It be Rick’s. It has his name on it.
A.
mustn’t
B.
can’t
C.
must
D.
need
【简答题】A．胆固醇结石 B．胆色素结石 C．混合性结石 D．泥沙样结石 胆道感染后发生的胆道结石多为 A． B． C． D．
【简答题】There seems to be an electrical problem. I’ll get someone to ____it. A) look at B) look into C) look upon D) look out
【单选题】—Look! It be the new woman manager. —It be her. She has just left for shanghai. [ ]
A.
can ; mustn't
B.
must ; can't
C.
must ; mustn't
D.
can't ; must
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