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【单选题】
-My decision_____school when l was only 15 was the worst mistak e s I ever made.A.
to quit
B.
quit
C.
quitting
D.
having quit
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反馈参考答案：
举一反三
【简答题】MRI成像的主要优势有哪些?
【单选题】Consider the following problems: Overcrowded public highways, overfishing in the ocean, polluted air, and the near-extinction of the wild rhinoceros. What do these problems have in common?
A.
Private markets could easily solve them if governments left the markets alone.
B.
They would all go away if the government sponsored an intensive public-information campaign.
C.
They are all the result of a failure to establish clear property rights over something of value.
D.
They are all the result of a failure of corrective taxes.
【单选题】These wild flowers are so special I would do ______I_______ them.
A.
what；can save
B.
all what；can to save
C.
what；can to save
D.
everything；can save
【单选题】铰链四杆机构的最小传动角可能发生在（）位置之处。
A.
主动曲柄与连杆二次共线
B.
主动曲柄与连架杆二次共线
C.
主动曲柄与摇杆二次共线
D.
主动曲柄与机架二次共线
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