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【单选题】
平面连杆机构中的运动副都是（ ），因此平面连杆机构是低副机构。A.
低副
B.
机构
C.
D.
低副机构
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反馈参考答案：
举一反三
【单选题】______ is a winner in the competition.
A.
The runner who breaks the record
B.
The runner who covers the whole distance
C.
The runner who runs to keep fit
D.
The runner who doesn’t break the rules
【单选题】Who is the winner of the talent show?
A.
Tiny Joe Dixon
B.
Jimmy Early
C.
Curtis Taylor
【简答题】Who is the second winner of the race?
【单选题】Who is the second woman Nobel Prize winner in the video ?
A.
B.
Tu Youyou
C.
Marie Curie
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