【判断题】执行“清空回收站”命令,则意味着永久性地删除了文件
【单选题】设A、B为任意两个事件,且A B,P(B)>0,则下列选项必然成立的是( )
【单选题】Kate spends her free time doing ________ work at an animal shelter.
【单选题】The year 1886 is in the_____ century. [ ]
【简答题】Li Ping was born_________ . A.in the year 1984,at 10 a.m.on June 18th B.on June 18th at 10 a.m.in the year 1984 C.at 10 a.m.in the year 1984 on June 18th D.at 10 a.m.on June 18th in the year 1984
【判断题】若事件A、B互斥,且P(A)>0,P(B)>0,则P(A|B)=0
【单选题】The population of the world in 20th century became very much ______ than that in 19th. [ ]
【单选题】君自身の問題だから、「やめてしまえ」( )、いまいちど考え直してみたらどうだろうか。
【单选题】设A、B为任意两个事件,且A ⊂ B,P(B)>0,则下列选项成立的是( ).
【判断题】设A、B为两事件,且P(A)>0,P(B)>0,若A、B独立,则A、B一定互斥;若A、B互斥,则A、B一定独立。