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【简答题】
求图所示各电路的等效电阻R ab ，其中R 1 =R 2 =1Ω，R 3 =R 4 =2Ω．R 5 =4Ω，G 1 =G 2 =1S，R=2Ω。
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反馈参考答案：
举一反三
【简答题】In order to know the customer and its expected buying, an effective marketing strategy STP is needed which is short for segmentation, targeting and ________.
【单选题】Which of the following is true about Mark Twains autobiography?
A.
It follows the chronological order in narration.
B.
It has never been published before.
C.
It holds no interest for modern readers.
D.
It crosses out some sensitive passages.
【单选题】If I had a million dollars, I would _________ . [ ]
A.
give it to charity
B.
give it charity
C.
give charity to it
D.
gave charity it
【单选题】If I had a million dollars, I’d give it away to___/′medik?l/ research.
A.
medicine
B.
medical
C.
magazine
D.
metal
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