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【单选题】
关于创业,下列说法正确的是( )
A.
创业、敢创业是创业成功的必要前提
B.
口才不好的不能创业
C.
创业者的心理素质是与生俱来的
D.
有资金就能创业成功
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D.
倾斜排版
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B.
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【单选题】如图所示 , 一有限范围的匀强磁场 , 宽度为 d , 将一边长为 l 的正方形导线框以速度 v 向右匀速地通过磁场区域 , 若 d > l , 则导线框中不产生感应电流的时间应等于 ( )
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