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

I If f(t)=100 for 04.(a) Calculate v at t=T/4.(b) Find the average power delivered by this waveform to a 5Q2 resistor 3 Let v(t)=3-3 cos(100 t-40)+4 sin(200 T t-10)+2.5 cos 300 tt V Find: (a)the average value Var;(b)the rms value V;(c)the period T; (d)v(18ms)

I Consider the graph shown in Fig. 15-15. Denote the tree made up of b 6, bs, and b, by t (a)Find all the fundamental loops of this graph corresponding to T (b) Find all the fundamental cutsets of this graph corresponding to t (c) Write the incidence matrix of this graph choose n 4 as the datum

一、选择题(请选择正确答案的英文字母代码,每题至少有一个正确答案13分) ()1.已知0.10mol.l-1fec3溶液的hJ1.6,与Fe(H20)63+的酸电离常数据最接近的数据是: A.5×10-2B.7×10-3C.5×10-4.8×10-4