【单选题】【消耗次数:1】
It [填空] him an hour to finish his work.
take
takes
took
taking
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相关题目
【单选题】 The test [填空] him two hours to finish.
①  take
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③  took
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【单选题】 It [填空] him half an hour to write the letter.
①  take
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①  正确
②  错误
【判断题】 It take me two hours to finish my work today.
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【单选题】 he tried [] but failed to finish his work in time.
①  hard
②  hardly
【单选题】 It [填空] two hours for him to repair his computer.
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【单选题】 A: That was a great dinner. [填空] B: Thanks. But it really only took an hour.
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【单选题】 He’s determined to finish the job __________ long it takes.
①  no matter
②  however
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随机题目
【单选题】 三个箱子,第一箱中有4个黑球1个白球,第二箱中有3个黑球3个白球,第三个箱中有3个黑球5个白球,现随机取一个箱子,再从这个箱中取出一个球,则取到白球的概率是( ).
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②  9/19
③  67/120
④  10/19
【单选题】 <img src=https://huaweicloudobs.ahjxjy.cn/3F44424811773A9DEA14A317F21E100F.png title=题干.png alt=题干.png width=695 height=46 style=width: 695px; height: 46px;/>
①  <img src=https://huaweicloudobs.ahjxjy.cn/B4A1FBBB05D41179A1A0905BF4B3FCA2.png style=width: 352px; height: 98px; title=2.png width=352 height=98/>
②  <img src=https://huaweicloudobs.ahjxjy.cn/3B3009B83E7506FCF15373A7F0F67602.png title=1.png style=white-space: normal; width: 352px; height: 74px; width=352 height=74/>
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④  <img src=https://huaweicloudobs.ahjxjy.cn/7D23572729288CD7605F165B1809FB33.png title=4.png style=white-space: normal; width: 401px; height: 94px; width=401 height=94/>
【单选题】 设X,Y独立同分布,记U=X-Y,V=X+Y则U与V满足
①  不独立
②  独立
③  相关系数不为0
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①  0.1
②  0.15
③  0.2
④  0.25
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①  独立但分布不同;
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③  独立同分布;
④  不能确定
【单选题】 若两个随机变量X,Y相互独立,则它们的连续函数g(x)和h(y)所确定的随机变量( ).
①  不一定相互独立
②  一定不独立
③  也是相互独立
④  绝大多数情况下相独立
【单选题】 <img src=https://huaweicloudobs.ahjxjy.cn/DE0B303CD9B0D9E07BAA348D594E6EEE.png title=题干.png alt=题干.png width=805 height=84 style=width: 805px; height: 84px;/>
①  <img src=https://huaweicloudobs.ahjxjy.cn/1E630CD3D1616B1241329F59B82EC103.png style= title=1.png/>
②  <img src=https://huaweicloudobs.ahjxjy.cn/DF9D30A20651AFBE6C69A70B1592EC9F.png title=3.png style=white-space: normal;/>
③  <img src=https://huaweicloudobs.ahjxjy.cn/46629B4BD3E0D61047901F0BE8C34111.png title=2.png style=white-space: normal;/>
④  <img src=https://huaweicloudobs.ahjxjy.cn/FD6622733B31283F27C3B193A92D77C0.png title=4.png style=white-space: normal;/>
【单选题】 将一枚硬币连抛两次,则此随机试验的样本空间为( )
①  {(正,正),(反,反),(一正一反)}
②  {(反,正),(正,反),(正,正),(反,反)}
③  {一次正面,两次正面,没有正面}
④  {先得正面,先得反面}
【单选题】 设A,B为随机事件,P(AB)=0则( ).
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②  AB未必是不可能事件
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④  P(A)=0或P(B)=0
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①  <img src=https://huaweicloudobs.ahjxjy.cn/37EFF5E04B06643C14AD920EE3C0A71F.png style= title=2.png/>
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③  <img src=https://huaweicloudobs.ahjxjy.cn/B359E51153DA44B31870C02660FADFD4.png title=3.png style=white-space: normal;/>
④  <img src=https://huaweicloudobs.ahjxjy.cn/840AC675A875D4E7DEF7E0BBCA86945F.png title=4.png style=white-space: normal;/>