(1) 5只电池，其中有2只是次品，每次取一只测试，直到将2只次品都找到．设第2只次品在第X(X=2，3，4，5)次找到，求X的分布律(注：在实际上第5次检测可无需进行)．(2) 5只电池，其中2只是次品，每次取一只，直到找出2只次品或3只正品为止．写出需要测试的次数的分布律．
What are the different eras or periods? One of the ways history is commonly divided is into three separate eras or periods:the Ancient Period (3600 BC - 500 AD), the Middle Ages (500 -1500), and the Modern Era (1500-present). According to this classification, the eras last hundreds of...
Don't hesitate anymore. The best time to invest is now. Employers are encouraged to B sales in the form. A travel accent is a person of business that arrange these people's holidays and then raise. Although the young man failed in starting his own business, he didn't lose face. The ...
attitudestowardstexting.D.Tosuggesttherightuseofpunctuationmarks.( )6.WhyisJuanAbenanteRinconmentionedinthetext?A.Tomakeassessmentsontherecentstudy.B.Toconfirmthefindingsoftherecentstudy.C.Toputforwarddoubtsabouttherecentstudy.D.Toshowgreatoppositionfortherecen... ...
periods of history – terms like ‘ Classical’ or ‘Romantic’ don’t simply represent a given number of years but rather the beliefs and attitudes of certain people. So it’s better for you to think of these different eras of music as a rough guide rather than an exact set of dates....
And this reciprocal action also involves reciprocity between present and past, since the historian is part of the present and the facts belong to the past. The historian and the facts of history are necessary to one another. The historian without his facts is rootless and futile; the facts ...
10. A) The themes of love and loss. 11. C) They often get rewarded instead of beingpunished. 12. B) It is what employers are increasingly seeking after. 13. A) Make better choices. 14. D) People often work in teams....
His contributions to English literature are threefold. First, a number of Latin books of educative value were translated into West Saxon dialect. It is said that King Alfred himself translated the history by Bede. Secondly, Alfred was responsible for the launching of The Anglo-Saxon Chronicle. ...
What was the first civilization to arise in Ancient Greece? What are the two main periods of Roman history called? What did the ancient Greeks contribute to western civilization? What was Sparta known for in early Greece literature? What happened during the period known as the Hellenistic age?
The development of the English language can be divided into three periods: Old English, Middle English and Modern English. 英语属于印欧语系的语言家族(印欧语系)。这个语系包括今天使用的大部分欧洲语言。英语属于这个语系的日耳曼语族。这个语系大约在3000年前开始作为一种通用语言,后来分为三个不同的亚语系:...