一、数学期望的定义 1.离散型RV的数学期望 引例:掷一枚骰子,掷出第i面得i分,某人掷了n次,求其所得的平均分。 定义1.设离散型R的分布律P{X=xn}=pnn=1,2,…

掌握微型计算机接口技术的基本概念 了解主机与外设之间的各种数据传送方式 了解I/O端口的寻址方式

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Unit 2 Aims TextA Words accompany, attractive, crazy, influence, I communication create instrument, mostly, perform, popular, similar, I entertain, export, festival symbol musical, occasion, religion

Words accompany, attractive, crazy, influence, I communication create instrument, mostly, perform, popular, similar, I entertain, export, festival symbol musical, occasion, religion religious. remind Phrases be similar to, go back to, grow up, have all over, bring together,go

Words accompany, attractive, crazy, influence, I communication create instrument, mostly, perform, popular, similar, I entertain, export, festival symbol musical, occasion, religion religious. remind Phrases be similar to, go back to, grow up, have all over, bring together,go influence on, not only . but also

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三种基本形式 If had a bike.I would lend it to you(f从句用过去时,主句用 should/ would/ could/ mighti不定式) If he had been here he would have helped you(从句过去完成时,主句 should would/ could/ might+不定式完成时) I would do it some other wa(从句用 should/ were to3主句用 should/woud could /might+不定式)