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【单选题】
Arnold Scaasi was critical of Mr. Wu ’ s design for Mrs. Obama, because .A.
he was envious of Mr Wu
B.
the colour of the dress was too bright
C.
the dress was loose
D.
Mrs. Obama didn ’ t look good in that dress
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【简答题】Life in 2060 Let us suppose it is now about A.D. 2060. Let’s make believe (假装；虚构) it is about sixty years from now. Of course, things have changed and life is very different. Voyages to the moon are b...
【单选题】已知某机械中等效构件的最大及最小角速度分别为: ω max =200rad/s及 ω min =180rad/s,则设备的运转速度不均匀系数 δ 为( )
A.
0.105
B.
1.000
C.
0.5
D.
条件不全，无法求解
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