【单选题】【消耗次数：1】
Try ___ he might, he couldn’t get out of difficulty.
①
when
②
where
③
till
④
as
参考答案：
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相关题目
【判断题】
She is under the impression that he isn’t a __genuine____ person for he wouldn’t tell her where and when he went to university.
①
正确
②
错误
【单选题】
A sudden idea ____ to him that he might try the new method.
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occurred
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happened
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took place
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took part
【单选题】
____ by this, he couldn’t say anything.
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Satisfied
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Feared
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Frightened
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Encouraged
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When father was young, he ______from morning till night.
①
was made work
②
was made working
③
made to work
④
was made to work
【判断题】
判断线上的内容是否正确：She is under the impression that he isn’t a __genuine____ person for he wouldn’t tell her where and when he went to university.
①
正确
②
错误
【单选题】
When he was 65,he[填空] that he didn’t want to stop
①
decided
②
decides
③
will decide
④
is deciding
【单选题】
—Where is John? I couldn’t find him.— .
①
He is very busy
②
I suppose he could have gone to the meeting room
③
I couldn’t agree more
④
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【单选题】
That young boy couldn’t move because he _______ his leg.
①
breaks
②
broke
③
had broken
【单选题】
2.I couldn’t understand why he pretended ______ in the bookstore.
①
to see me not
②
not to see me
③
not see me
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to see not me
【单选题】
Joseph was very lucky ____ with his life; he almost did not get out of the room.
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to escape
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to have escaped
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to escaping
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随机题目
【判断题】
设二维随机变量<img class=jc-formula data-tex=(X,Y) src=https://huaweicloudobs.ahjxjy.cn/5397F429C2F8D6C371FC104B680E7FA8.png style=vertical-align: middle;/>联合分布密度函数为:<img class=jc-formula data-tex=f(x,y)=\left\{ \begin{ matrix } k{ e }^{ -(2x+y) },x0,y0, \\ 0,其他， \end{ matrix } \right src=https://huaweicloudobs.ahjxjy.cn/5D1F623136C9C55E2DA3BF1AD4A1BD74.png style=vertical-align: middle;/>则<img class=jc-formula data-tex=k=2 src=https://huaweicloudobs.ahjxjy.cn/3E6586508093C30A8CD48505A508CDB8.png style=vertical-align: middle;/>
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错误
【判断题】
设二维随机变量<img class=jc-formula data-tex=(X,Y) src=https://huaweicloudobs.ahjxjy.cn/5397F429C2F8D6C371FC104B680E7FA8.png style=vertical-align: middle;/>联合分布密度函数为:<img class=jc-formula data-tex=f(x,y)=\left\{ \begin{ matrix } k{ e }^{ -(2x+y) },x0,y0, \\ 0,其他， \end{ matrix } \right src=https://huaweicloudobs.ahjxjy.cn/5D1F623136C9C55E2DA3BF1AD4A1BD74.png style=vertical-align: middle;/>则<img class=jc-formula data-tex=P(Y\le X)=\frac { 1 }{ 3 } . src=https://huaweicloudobs.ahjxjy.cn/43776E97E8288B89F779473B4F3A8972.png style=vertical-align: middle;/>
①
正确
②
错误
【简答题】
在开发大型、复杂系统工程的过程中，为了降低复杂程序，人们习惯把系统进一步划分成几个不同的[填空]。
【判断题】
设随机变量<img class=jc-formula data-tex=X,Y src=https://huaweicloudobs.ahjxjy.cn/7ADC839F5F3346E7C68A191C8BA75ADA.png style=vertical-align: middle;/>相互独立且都服从正态分布，则<img class=jc-formula data-tex=X+Y src=https://huaweicloudobs.ahjxjy.cn/5DB40891FAF3B46DDD62CE9621200191.png style=vertical-align: middle;/>也服从正态分布。
①
正确
②
错误
【简答题】
[填空]描述系统的控制结构，它是用来确定各个对象之间交互及整体的控制结构的模型。
【单选题】
UML的主要目标是，以( )的方式描述任何类型的系统，最常用于建立软件系统的模型，也可以描述非软件领域的系统。
①
结构图
②
面向对象图
③
系统流程图
④
面向过程的图
【判断题】
若<img class=jc-formula data-tex=X\sim B(n,p) src=https://huaweicloudobs.ahjxjy.cn/B3FC371ECDDF58427182919672DF0B3A.png style=vertical-align: middle;/>,其期望为<img class=jc-formula data-tex=n(1-p) src=https://huaweicloudobs.ahjxjy.cn/4A2032E034225E643780BF4A810802C1.png style=vertical-align: middle;/>.
①
正确
②
错误