-I'minterestedinthatchair.Howmuchdoyouwantforit?-$25.00.-.I'llgiveyou$15.00.-Nothat'snotenough.[]A.ThechairisreallyniceB.That'stoomuchC.Pleaselowerth
-I'm interested in that chair.How much do you want for it?
-$25 . 00.
-________.I'll give you $15 . 00.
-No that's not enough.
A. The chair is really nice
B. That's too much
C. Please lower the price
D. Nobody will have it except me
二元函数积分的应用题一个气球的体积被定义为V=(e^-h)/(1+t^2),h(t)>0表示在t时 2020-06-03 …
∮1dx/(x^2+y^2+z^2)ds,其中,曲线x=(e^t)sinty==(e^t)cost 2020-06-03 …
X(t)=e2tu(-t),h(t)=u(t-3),求X(t)与h(t)的卷积X(t)=e的2t次 2020-06-06 …
讨论:关于如何求卷积x(t)*h(-t)的积分表达式?以前信号与系统里学过了x(t)*h(t)的表 2020-06-06 …
r"+3r=2e'求冲激响应求到h(t)=A*e^-3t*u(t)+Bδ(t)了也知道r(0+)= 2020-06-23 …
用以下英文宇母填在上a,a,a,a,a,a,b,e,e,d,e,e,e,e,e,e,f,g,g用以 2020-06-24 …
|E-A|=|AA^T-A|=|A(A^T-E^T)|,其中A是转置矩阵,为什么这里E也要跟着转置 2020-07-09 …
观察高台跳水运动员的高度h随时间t变化的函数h(t)=-4.9t2+6.5t+10的图象,及运动员 2020-07-13 …
英语单词填空1.时间状语:d-r-n-2.场所:b-s-s-o-f-r--e-a-t-e-t3.教 2020-07-14 …
写单词,这些单词打乱顺序了!:1.d,f,e,n,i,f,e,r,t,()2.g,h,o,e,t, 2020-07-26 …