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【单选题】
图示电路中,对负载电阻R L 而言,虚线框中的电路可用一个等效电源代替,该等效电源是( )。A.
理想电压源
B.
理想电流源
C.
不能确定
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【单选题】The History of the English DictionaryIn 1746, Samuel Johnson began to work on his most famous book, the Dictionary of the English Language. It took him nine years to complete and in that time, he wrot...
A.
was older than Johnson by twenty-one years
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helped Johnson to get the dictionary writing job
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【单选题】The History of the English DictionaryIn 1746, Samuel Johnson began to work on his most famous book, theDictionary of the English Language. It took him nine years to complete and in that time, he wrote...
A.
dictionary to include so many words
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dictionary in the world
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English dictionary to have 40,000 words
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