听力原文:W:You ought to write to Eleanor.She's been sick and she does so like to get letters. M:All right.I have been busy,but I shouldn't have neglected her. Q:What do we learn about Eleanor? (16)
A.
She likes to write letters.
B.
She hasn't seen her friends lately.
C.
She is eager to get man's cares.
D.
She lives together with the two speakers.
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【单选题】电路如图所示,假设运算放大器是理想的,则图(a) A v = v O/ v I = , R i = ;图(b) A v = v O/ v I = , R i = 。
A.
图(a) A v = 11 , R i =1 kΩ ;图(b) A v =1; R i =∞
B.
图(a) A v = -10 , R i =1 kΩ ;图(b) A v =1; R i =1 kΩ