【简答题】【消耗次数:1】
空间曲线的三个基本向量记为a,b,c,则(a,b,c)是多少?
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相关题目
【单选题】 设A,B,C为三个事件,则ABC表示
①  A,B,C都发生
②  A,B,C都不发生
③  A,B,C至少有一个发生
④  A,B,C不多于一个发生
【判断题】 设A,B,C为三个事件,若P(ABC)=P(A)P(B)P(C),则事件A,B,C相互独立
①  正确
②  错误
【判断题】 若三个事件A,B,C满足P(AB)=P(A)P(B),P(AC)=P(A)P(C),P(BC)=P(B)P(C),则称A,B,C相互独立。
①  正确
②  错误
【多选题】 三个事件A,B,C相互独立,应满足的条件是
①  P(AB)=P(A)P(B)
②  P(BC)=P(B)P(C)
③  P(AC)=P(A)P(C)
④  P(ABC)=P(A)P(B)P(C)
【判断题】 若A∪B= A∪C, 则B=C。
①  正确
②  错误
【判断题】 设A、B、C为三事件,若满足:P(AB)=P(A)P(B),P(AC)=P(A)P(C),P(BC)=P(B)P(C),则三事件A、B、C 必然相互独立。
①  正确
②  错误
【单选题】 inta=1,b=2,c=3; if(a>b)a=b; if(a>c)a=c; 则a的值为().
①  1
②  2
③  3
④  不一定
【判断题】 A∪B∪C”表示三事件A、B、C至少有一个发生。
①  正确
②  错误
【判断题】 设 A、B、C 为 三事件,若满足:三事件两两独立,则三事件 A、B、C相互独立
①  正确
②  错误
【单选题】 设A,B,C为三个事件,且A,B相互独立,则以下结论中不正确的是
①  若P(C)=1,则AC与BC也独立.
②  若P(C)=1,则<img class=jc-formula data-tex=A\cup C src=https://huaweicloudobs.ahjxjy.cn/ECFBDDF24996917EA300075A2EF96068.png style=vertical-align: middle; width: 56px; height: 20px; width=56 height=20/>与B也独立.
③  若P(C)=0,则<img class=jc-formula data-tex=A\cup C src=https://huaweicloudobs.ahjxjy.cn/ECFBDDF24996917EA300075A2EF96068.png width=56 height=20 style=font-family: 宋体; font-size: 14px; white-space: normal; vertical-align: middle; width: 56px; height: 20px;/>与B也独立.
④  若<img class=jc-formula data-tex=C\subset B src=https://huaweicloudobs.ahjxjy.cn/5AF7C06E7D78B9242171900D637B5C9F.png style=vertical-align: middle; width: 51px; height: 23px; width=51 height=23/>,则A与C也独立
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【单选题】 When he came back after an absence of 20 years, he found his hometown completely ____. ?
①  changing ?
②  to be changed ?
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①  for ?
②  and ?
③  yet ?
④  or?
【单选题】 With the old man ____ the way, we had no trouble in finding that mysterious cave.
①  leading
②  led
③  lead
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①  listen--hearing
②  hear--listening
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【单选题】 Lily: Hello, John! What was the weather like yesterday?John: ____
①  I like nice and bright weather.
②  You don’t like cold weather, do you?
③  That was a favorable weather.
④  Nice and bright, not too cold.
【单选题】 10. Far away around the corner I could see a small female ____advancing towards us.
①  body
②  figure
③  man
④  symbol
【单选题】 It is often more difficult to find trained men than ____ for scientific research.
①  getting financial support
②  to getting financial support
③  to get financial support
④  in getting financial support
【单选题】 “Here is the money I promised,” he said. “I always ____ promises.”
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【单选题】 The earth ____ heat and light from the sun.
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