设u=f(x2+y2,xz),z=z(x,y)由ex+ey=ez确定,其中f二阶连续可偏导,求.
参考答案:
解析:由ex+ey=ez得
_Were you at home last night?
_ No. I______to go to the concert.
A.invite
B.am invited
C.invited
D.was invited
最可能的诊断是
A.枕部皮样囊肿B.枕部脑膜凹陷C.枕部脑膜膨出D.枕部脂肪瘤E.枕部血管瘤