【单选题】【消耗次数：1】
The car accident happened_______a spring morning.
①
at
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on
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in
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【单选题】
The car accident left him with ( ) impaired hearing.
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possibly
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extremly
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permanently
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perspectively
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It happened to be very cold____ the morning of our sports meet. ?
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at ?
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of ?
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on ?
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with?
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He was ( ) old enough to drive a car at the time of the accident.
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rare
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barely
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eventually
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particularly
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The incident happened at a ( ) point in the campaign.
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critical
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global
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In Britain, the season of the year is probably _____ spring.
①
later
②
last
③
latter
④
late
【单选题】
____ find out what had happened.
①
Not until he woke up did he
②
Not until he woke up he
③
Until he woke up did he
④
Until he woke up he
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What’s happened to Jan?_______to hospital.
①
She’s been taken
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③
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He____________ working as if nothing had happened.
①
continue
②
continues
③
continuing
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随机题目
【判断题】
n维单位向量组<img class=jc-formula data-tex={ \E }_{ 1 },{ \E }_{ 2 },\cdots { \E }_{ n } src=https://huaweicloudobs.ahjxjy.cn/61A18AF2058D58BB2E93C4E167BF37FB.png style=vertical-align: middle;/>线性无关
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正确
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错误
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设<img class=jc-formula data-tex=\Omega src=https://huaweicloudobs.ahjxjy.cn/5C5240ED1AA8F3BE6C84F2DC0A12615D.png style=vertical-align: middle;/>为样本空间，<img class=jc-formula data-tex=\phi src=https://huaweicloudobs.ahjxjy.cn/66F04549ED509B01B218D3ABA3FAAC80.png style=vertical-align: middle;/>为不可能事件，<img class=jc-formula data-tex=B src=https://huaweicloudobs.ahjxjy.cn/4CEB8696C01DCD0803D103905D21BDE4.png style=vertical-align: middle;/>为样本空间中任一事件，则<img class=jc-formula data-tex=P(\Omega |B)=1，P(\phi |B)=0 src=https://huaweicloudobs.ahjxjy.cn/E3560C7120938EAF3BBE8AA2AB51E62A.png style=vertical-align: middle;/>
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正确
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错误
【判断题】
若事件A与事件B相互独立，则<img class=jc-formula data-tex=P(A\cup B)=P(A)+P(B)-P(A)P(B) src=https://huaweicloudobs.ahjxjy.cn/753E442A4835A5CA02DDB6CFC590B985.png style=vertical-align: middle;/>
①
正确
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错误
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对于条件期望，结论：<img class=jc-formula data-tex=E(E\{ \xi |\eta \} )=E\xi src=https://huaweicloudobs.ahjxjy.cn/2844601DA16A7B9D73F7A3F2FD9FD679.png style=vertical-align: middle;/>成立。
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正确
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错误
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行列式<img class=jc-formula data-tex=\left| 1\quad \quad 1\quad \quad 1\\ a\quad \quad b\quad \quad c\\ bc\quad ac\quad ab \right| =(a-b)(b-c)(c-a) src=https://huaweicloudobs.ahjxjy.cn/A131FCAD19586B83A687EF03AD81C1FA.png style=vertical-align: middle;/>
①
正确
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错误
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设两点分布的数学期望<img class=jc-formula data-tex=E\xi =p src=https://huaweicloudobs.ahjxjy.cn/165C9449B4A51B79CA802DDDC72C5EA5.png style=vertical-align: middle;/>,则其方差为<img class=jc-formula data-tex=D\xi =p(1-p) src=https://huaweicloudobs.ahjxjy.cn/B7CD506C431B0EF1C8E3E0D0F68E706D.png style=vertical-align: middle;/>
①
正确
②
错误