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四、 图所示电路，t＜0时开关S在a点电路已达稳态，若t=0开关S打至b点，求t＞0时的全响应u(t)，并定性画出波形。
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【单选题】3/13. What did the manager promise to do?
A.
a. to pay the woman a sum of money for compensation.
B.
b. to have every facility in the bathroom checked and fixed immediately.
C.
c. to change the room and provide a compensation.
D.
d. to ask the house keeper to see to the problems right away.
【单选题】—What errands did you have to do today? —___________________________.
A.
I’m in no hurry
B.
Done one, and another one to do.
C.
You can’t be serious
【单选题】What did Campos mean by saying 'I‘m hanging on their vote' in PARAGRAPH 3? 查看材料
A.
He meant that he was confident about the result of the vote.
B.
He meant that the voters' decision was crucial to his future.
C.
He meant that he had to attend a community college if the voters said NO.
D.
He meant that he might have to leave the country if the voters said NO.
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