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【简答题】
设二维随机变量(X,Y)的联合分布由下表给出,且X与Y相互独立,试确定表中a,b,c的值
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图中无螺母
【单选题】石灰在建筑物中不宜:
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【单选题】(单选)下面组建创业团队的步骤正确的是?
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D.
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B.
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C.
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none
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