【单选题】【消耗次数:1】
33.Modern science and technology has _____ communication between people far apart.
madeconvenient
madeitconvenient
madeitconvenientfor
madeitconvenientto
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相关题目
【单选题】 There can be no ( ) understanding without communication between people.
①  mutually
②  mutuality
③  mutual
④  mutualism
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①  in
②  at
③  on
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①  given
②  will be given
③  has been given
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①  sharp
②  dreadful
③  intense
④  delicate
【简答题】 Translate the following sentence into ChineseRapid industrial growth makes new demands on science and technology.
【单选题】 The new technology has been ( ) in the industrial production.
①  utilized
②  possessed
③  elevated
④  focused
【单选题】 Many people complain of the rapid _____ of modern life.
①  rate
②  speed
③  pace
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【单选题】 Mary Kingsley believed that Africans could learn technology____________ and would finally move into the modern world.
①  gladly
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①  so is
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随机题目
【多选题】 下列说法正确的是
①  若行列式有一行元素全为零,则行列式等于零。
②  若行列式有两列元素对应相等,则行列式等于零。
③  若行列式主对角线元素全为零,则行列式等于零。
④  若对角行列式主对角线元素有零,则行列式等于零。
【多选题】 事件A,B发生,而C不发生,用事件的运算可表示为
①  <img class=jc-formula data-tex=AB\bar { C } src=https://huaweicloudobs.ahjxjy.cn/7AFCB5E4F0D721D287516BB53D312637.png style=vertical-align: middle;/>
②  <img class=jc-formula data-tex=(A\bigcup B)\bar { C } src=https://huaweicloudobs.ahjxjy.cn/13DA37708FBF3E2BA2832AD6DE6BCF87.png style=vertical-align: middle;/>
③  <img class=jc-formula data-tex=AB-C src=https://huaweicloudobs.ahjxjy.cn/6BC84DEF4F6FB9F0C1F005EF18A081F7.png style=vertical-align: middle;/>
④  <img class=jc-formula data-tex=AB\subset C src=https://huaweicloudobs.ahjxjy.cn/461F7D6E053A622C706FD0D49C850E0C.png style=vertical-align: middle;/>
【多选题】 下列说法错误的是
①  单个的非零向量必定线性无关。
②  含零的向量组必定线性相关。
③  向量个数不同的向量组不可能等价。
④  矩阵相乘,秩会变大。
【多选题】 下列说法错误的是
①  <img class=jc-formula data-tex=若{ A }^{ 2 }=O,则A=O src=https://huaweicloudobs.ahjxjy.cn/3B66014D1B6692FC28DA836BA1245187.png style=vertical-align: middle;/>
②  <img class=jc-formula data-tex=若{ A }^{ 2 }=A,则A=O或A=E src=https://huaweicloudobs.ahjxjy.cn/6E10525373636B3D0D16AA6AC9B5E162.png style=vertical-align: middle;/>
③  <img class=jc-formula data-tex=若{ A }X=AY,则X=Y src=https://huaweicloudobs.ahjxjy.cn/1786D86226E3FFF2862F9172E1D898F5.png style=vertical-align: middle;/>
④  <img class=jc-formula data-tex=若{ A }\neq O,则\quad |A|\neq 0 src=https://huaweicloudobs.ahjxjy.cn/6DFE86EFAD061FF9AFB29FB9DAD9F913.png style=vertical-align: middle;/>
【单选题】 一个家庭有三个孩子,若已知有女孩,则有男孩的概率为
①  1/2
②  1/4
③  6/7
④  7/8
【单选题】 考察某地区一季度温度变化情况,设温度是Y,则Y是
①  连续性随机变量
②  离散型随机变量
③  既是离散型随机变量也是连续性随机变量
④  既不是离散型随机变量也不是连续性随机变量
【单选题】 若随机变量X的分布律为<img class=jc-formula data-tex=P(X=i)=c({ \frac { 2 }{ 3 } ) }^{ i },i=1,2,3 src=https://huaweicloudobs.ahjxjy.cn/6B752A6007778AEB836111B13C238E6A.png style=vertical-align: middle;/>,则 c=( )
①  21/38
②  27/38
③  29/38
④  35/38
【单选题】 设<img class=jc-formula data-tex=P(A)=p,P(B)=q,P(A\cup B)=r src=https://huaweicloudobs.ahjxjy.cn/181E43153EA4CC8D9DFCC275A4A92148.png style=vertical-align: middle;/>,则<img class=jc-formula data-tex=P(AB) src=https://huaweicloudobs.ahjxjy.cn/1F4CF88471561CF95E40A8580E57081A.png style=vertical-align: middle;/>=( )A. p-q-r; B.p+q-r; C.r-q; D.1-p-q+r.
①  A
②  B
③  C
④  D
【单选题】 若事件A、B满足P(A)+P(B)1,则A与B必定 (A) 独立 (B)不独立 (C)相容 (D)不相容
①  (A)
②  (B)
③  (C)
④  (D)
【单选题】 一批产品的一、二、三等品各占60%,30%,10%,从中任取一件,结果不是三等品,则该产品是一等品的概率为
①  1/2
②  1/4
③  1/3
④  2/3