—Can you ride a horse, Mike? —No, I ____ 发布时间:2017-05-09 03:35 │ 来源:www.tikuol.com 题型:选择题 问题: —Can you ride a horse, Mike? —No, I ______.A.can’tB.may notC.mustn’tD.needn’t
题型:选择题 设z=eusinv,而u=xy,v=x+y,则为()。A.exy[xsin(x+y)-cos(x+y)]B.exy[xsin(x+y)+cos(x+y)]C.exy[xsinxy+cos(x+y)]D.exy[ysin(x+y)+xcos(x+y)] 查看答案