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王老师:19139051760(拨打)
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第1题

)Customers are allowed to _______ the new product before they decide to make the purchase. A. select B. sample C
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第2题

He said that he would travel abroad ________. A. now B. the following year C. two years before D. two years ag
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第3题

(1分)You’ll have to work harder to ___________ up with the top students in your class. A. take B. hold C. catch
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第4题

二维随机变量(ξ、η)~N(1,2,32,52,2)的Cov(ξ、η)为30。(本题2.0分) A、 正确 B、 错误
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