8-1串行扩展概述 一、串行扩展特点 (1)最大程度发挥最小系统的资源功能。 原来由并行扩展占用的P0口、P2口资源,直 接用于I/0口。 (2)简化连接线路,缩小印板面积 (3)扩展性好,可简化系统的设计。 (4)串行扩展的缺点:

一、选择题:1~8小题,每小题4分,共32分,下列每小题给出的四个选项中,只有一项 符合题目要求,把所选项前的字母填在题后的括号内 (1)设函数f(x)在区间[-1,1]上连续,则x=0是函数g(x)=的() (A)跳跃间断点 (B)可去间断点 (C)无穷间断点 (D)振荡间断点 解:B

图4.24(a)为单流程SFC:只有一个转移条件并转向一个分支的 单流程状态编程。图4.24(b)为选择结构SFC:要按不同转移 条件选择转向不同分支,执行不同分支后再根据不同转移条件汇 合到同一分支。图4.24(c)为并行结构SFC:要按同一转移条件 同时转向几个分支,执行不同的分支后再汇合到同一分支

一、由电路求响应 由S域等效电路 1.元件→域运算阻抗R,L,M,C→R,L,M、 sC信号→象函数i(t),u(t)→I(s),U(s)

主要内容小结: 1、C、L元件的VCR; 2、(t)+r2(t=rt 3、三要素法 r(t)=r(∞)+r)-r(∞)e 4、阶跃信号ε(t)与阶跃响应S(t)

Outline Q Describe the purpose of adjusting accounts at the end of the period Q Prepare and explain adjusting entries for prepaid expenses, amortization, unearned revenues, accrued expenses, and accrued revenues。 C Explain how accounting adjustments link to financial statements Q Explain and prepare an adjusted trial

1. David Company has the following information at the year-end for the preparation of adjusting entries: a. Of the $10000 balance in unearned revenue, $7000 has been earned. b. The annual building depreciation is $20000 C. Services provided to customers at the last day of the year unbilled totally 35000. d. Rent of 3000 for the Dec. is unpaid and unrecorded

1 热辐射特点 (1)定义:由热运动产生的,以电磁波形式传递的能量; (2)特点:a任何物体,只要温度高于0K,就会不 停地向周围空间发出热辐射;b可以在真空中传 播;c伴随能量形式的转变;d具有强烈的方向性 e辐射能与温度和波长均有关;f发射辐射取决于 温度的4次方

Then =1-91=1(3+:2)(3+2n 可=-1-3)=1(4-+2)(1-2+a With 1 0 O: Thus, in equilibrium, we must have ai=.2. In fact, the two firms must sit in the middle By Proposition 2.1, Pi=p?=c Discussion

A:图1,螺母未拧紧螺栓螺母松驰状态 B:图2,拧紧一预紧状态 凸缘压—62-F栓杆拉-61→F c:图3,加载F后→工作状态