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【单选题】
若随机变量【图片】、【图片】的分布函数分别为【图片】与【图片】，则【图片】、【图片】取值为 时，可使【图片】为某随机变量的分布函数.A.
B.
C.
D.
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【单选题】虽然解决了桥梁构造设计的难题，实际建造中仍然面临许多困难。
A.
Although the problem of the design for the structure of the bridge has been overcome, we are still confronted with many difficulties concerning its actual construction.
B.
Although the problem of the design for the structure of the bridge has been overcome, we still confront many difficulties concerning its actual construction.
C.
/
D.
/
【简答题】While we_1___(wait) for the bus, a girl_2___( run) up to us.
【简答题】稳压电源电路如图所示,(1) 该电路输出电压U0值为多少伏?(2) 若测得UC=12V,问U2值为多少?(3)若已知U2=20V,并测得UC=18V,分析电路发生了什么的故障?
【单选题】虽然解决了桥梁构造设计的难题，实际建造中仍然面临许多困难。
A.
Although we have overcome the problem of the design for the structure of the bridge, we still confront many difficulties concerning its actual construction.
B.
Although the problem of the design for the structure of the bridge has been overcome, we are still confronted with many difficulties concerning its actual construction.
C.
/
D.
/
【单选题】虽然解决了桥梁构造设计的难题，实际建造中仍然面临许多困难。
A.
Although we have overcome the problem of the design for the structure of the bridge, we are still confronted with many difficulties concerning its actual c onstruction.
B.
Although the problem of the design for the structure of the bridge has been overcome, we still confront many difficulties concerning its actual construction.
C.
/
D.
/
【简答题】电路如图所示,已知 R 1 =10kΩ ,R 2 =20k Ω ,若 u i =1V,则u O =A. －2 V B. C. D. B. －1.5 V C. +0.5 V D. -0.5 V
【简答题】Task 4Rewrite the following passage , giving thesentences some variety in length and structure: 1. I got up alittle later than usual on Sunday morning. I washed and had a quick breakfast. Then I start...
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