Builds on PHA as a foundation (expands PHA) Considers system as a whole and identifies how system operation nterfaces and interactions between subsystems interface and interactions between system and operators component failures and normal (correct) behavior

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1.1(3)将AUB拆成互不相交的集合的并:AUB=A(b-)=aub-A,再由 概率的可加性可得 (4)因为BCA,所以A=BUA-B,由此可得。 1.3当A∩B≠中时,(A)共有16个元素。当∩B=中时,o(A)有8个元素。不难写出

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定义1设a1,a2,…,am,β是一组n维 向量,若存在m个实数k1,k2,…km使得 β=ka1+k2a2++kmam,则称β可以 由a1,a2,…,an线性表示( linear representation).或称a1,a2,…,an线性 表示(linear generate) 例如:a1=(1,2,0)T,a2=(1,0,3)T,a3= (3,4,3)T,则a3=2a1+a2,即存在实数k =2,k2=1使得a3=ka1+k2a2,故a3可以 由a1,a2线性表示。(大家想一想,这里的常 数k1=2,k2=1是怎么求出来的?)

1 If the voltage across a 5F capacitor is 2te -V, find the current and the power 2 In 5s, the voltage across a 40mF capacitor changes from 160v to 220V. Calculating the average current through the capacitor

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8.1.1(单项选择题)空间直角坐标系中的点A(,-2,3)位于第()卦限 A.二 B.四 C.六D.八 (难度:A;水平:b) 8.1.2(单项选择题)向量a=5i+2j-3k的模为(). A.6 B.4 C.38D.√38 (难度:B;水平a)